Ace Double

American company Ace Books began publishing genre fiction starting in 1952. Initially these were mostly in tête-bêche format with the ends of the two parts meeting in the middle and with a divider between them which functioned as the rear cover of both (the two parts were oriented upside-down with respect to each other in order to effect this), but the company also published some single volumes during the early years. The proportion of singles increased until they stopped producing doubles about 1978. The tête-bêche format was discarded in 1973, but future double novels were continued for a while with both parts oriented the same way, so that the first page of one part followed soon after the last page of the other part.

Between 1952 and 1968, the books had a letter-series identifier; after that date they were given five-digit numeric serial numbers. The list given here includes every Ace Double Book published between 1952 and 1978, for all genres. It gives a date of publication; in all cases this refers to the date of publication by Ace, and not the date of original publication of the novels. For more information about the history of these titles, see the entry for Ace Books, which includes a discussion of the serial numbering conventions used and an explanation of the letter-code system.

Genres and collectability

Ace published science fiction, mysteries, and Westerns, as well as books not in any of these genres. Several bibliographic references have been compiled for the science fiction books (see ).

Because the tête-bêche format is part of the attraction for some collectors, titles published between 1974 and 1978, which contained two titles by one or two authors but which are not tête-bêche, are not regarded by some collectors as true Ace Doubles. All the books are included in the list given below, with the difference in format noted.

The list given here includes an indication of the genre of the works, in italics after the serial number. Abbreviations used are "SF" for science fiction titles; "MY" for mystery titles, and "WE" for Westerns. In addition, "NA" is used to mean "not applicable", when one or both of the books is not in one of these three genres; and "UN", when the genre of the books is not known. The list also gives a date of publication; in all cases this refers to the date of publication by Ace, and not necessarily the date of original publication of the novels.

The list is thought to be complete, but there may be minor omissions among the later lists.

For more information about the history of these titles, see Ace Books, which includes a discussion of the serial numbering conventions used and an explanation of the letter-code system.

Jokes

The double format inspired contests for ironic or satirical combinations of titles that might appear, as in " No Blade of Grass"/" The Sheep Look Up".

D and S Series

*D-001 ''MY'' Samuel W. Taylor ''The Grinning Gismo'' / Keith Vining ''Too Hot For Hell'' (1952)
*D-002 ''WE'' William Colt MacDonald ''Bad Man's Return'' / J. Edward Leithead ''Bloody Hoofs'' (1952)
*D-003 ''MY'' Mel Colton ''The Big Fix'' / Kate Clugston ''Twist the Knife Slowly (A Murderer in the House)'' (1952)
*D-004 ''WE'' Lewis B. Patten ''Massacre at White River'' / Walter A. Tompkins ''Rimrock Rider'' (1952)
*D-005 ''MY'' Eaton R. Goldthwaite ''The Scarlet Spade'' / Harry Whittington ''Drawn To Evil'' (1952)
*D-006 ''WE'' William E. Vance ''The Branded Lawman'' / Nelson C. Nye ''Plunder Valley'' (1952)
*D-007 ''MY'' Stephen Ransome ''I, the Executioner (False Bounty)'' / Harry Whittington ''So Dead My Love!'' (1953)
*D-008 ''WE'' Allan K. Echols ''Terror Rides the Range'' / Tom West ''Gunsmoke Gold'' (1953)
*D-009 ''MY'' Michael Morgan ''Decoy'' / Sherwood King ''If I Die Before I Wake'' (1953)
*D-010 ''WE'' Leslie Scott ''The Brazos Firebrand'' / Gordon Young ''Hell on Hoofs'' (1953)
*D-011 ''MY'' Day Keene ''Mrs. Homicide'' / William L. Stuart ''Dead Ahead''
*D-012 ''WE'' Dudley Dean Mcgaughty (as Dean Owen) ''The Man From Boot Hill'' / Dan J. Stevens ''Wild Horse Range'' (1953)
*D-013 ''NA'' Theodore S. Drachman ''Cry Plague!'' / Leslie Edgley ''The Judas Goat'' (1953)
*D-014 ''WE'' Paul Evan Lehman ''Vultures On Horseback'' / George Kilrain ''Maverick With A Star'' (1953)
*D-015 ''MY'' William Burroughs (as William Lee) ''Junkie'' / Maurice Helbrant ''Narcotic Agent'' (1953)
*D-016 ''MY'' Edmond de Goncourt and J. De Goncourt '' Germinie'' / Paul Bourget '' Crime D'Amour'' (1953)
*D-017 ''MY'' William Campbell Gault (as Roney Scott) ''Shakedown'' / Howard Fast (as Walter Ericson) ''The Darkness Within''
*D-018 ''WE'' J. Edward Leithead ''The Lead-Slingers '' / Samuel Peeples (as Brad Ward) ''The Hanging Hills'' (1953)
*D-019 ''MY'' Hal Braham (as Mel Colton) ''Never Kill A Cop'' / Leslie Edgley ''Fear No More'' (1953)
*D-020 ''WE'' Roy Manning ''The Desparado Code'' / Allan K. Echols ''Double-Cross Brand''
*D-021 ''MY'' John N. Makris ''Nightshade'' / Lester Dent ''High Stakes'' (1953)
*D-022 ''WE'' Bliss Lomax ''Maverick Of The Plains'' / Leslie Scott ''Badlands Masquerader'' (1953)
*D-023 ''MY'' Louis Trimble (as Stuart Brock) ''Bring Back Her Body'' / Richard Sale ''Passing Strange'' (1953)
*D-024 ''WE'' Tom West ''Vulture Valley'' / John Callahan ''The Sidewinders'' (1953)
*D-025 ''NA'' P. G. Wodehouse ''Quick Service'' / ''The Code Of The Woosters'' (1953)
*D-026 ''NA'' Harold Acton and Lee Yi-Hsieh (translators) ''Love In A Junk And Other Exotic Tales'' / Charles Pettit ''The Impotent General'' (1953)
*D-027 ''MY'' Bruno Fischer ''The Fingered Man'' / Hal Braham (as Mel Colton) ''Double Take'' (1953)
*D-028 ''WE'' Paul Evans ''Gunsmoke Kingdom'' / William E. Vance ''Avenger From Nowhere'' (1953)
*D-029 ''MY'' Ross Laurence ''The Fast Buck'' / J. F. Hutton ''Dead Man Friday''
*D-030 ''WE'' George Kilrain ''South To Santa Fe'' / Samuel Peeples (as Brad Ward) ''Johnny Sundance'' (1953)
*D-031 ''SF'' A. E. van Vogt '' The World of Null-A'' / '' The Universe Maker'' (1953)
*D-033 ''MY'' Carl G. Hodges ''Murder By The Pack'' / Frank Kane ''About Face''
*D-034 ''WE'' Ken Murray ''Hellion's Hole'' / Ken Murray ''Feud In Piney Flats'' (1953)
*D-035 ''NA'' Rae Loomis ''The Marina Street Girls'' / Jack Houston ''Open All Night'' (1953)
*D-036 ''SF'' Robert E. Howard '' Conan the Conqueror'' / Leigh Brackett '' The Sword of Rhiannon'' (1953)
*D-037 ''MY'' Marvin Claire ''The Drowning Wire'' / Will Oursler ''Departure Delayed'' (1953)
*D-038 ''WE'' Bliss Lomax ''Outlaw River'' / Louis L'Amour (as Jim Mayo) ''Showdown At Yellow Butte''
*D-039 ''WE'' Frank Gruber ''Quantrell's Raiders'' / Frank Gruber ''Rebel Road'' (1953)
*D-040 ''MY'' Cornell Woolrich (as William Irish) ''Waltz Into Darkness'' / Malden Grange ''Bishop Scylla''
*D-041 ''MY'' Day Keene ''Death House Doll'' / Thomas B. Dewey ''Mourning After'' (1953)
*D-042 ''WE'' Walter A. Tompkins ''One Against The Bullet Horde'' / Charles M. Martin ''Law For Tombstone'' (1954)
*D-044 ''SF'' Donald A. Wollheim (ed.) ''The Ultimate Invader and Other Science-Fiction'' / Eric Frank Russell ''Sentinels From Space'' (1954)
*D-045 ''MY'' Martin L. Weiss ''Dead Hitches A Ride'' / Leslie Edgley ''Tracked Down'' (1954)
* D-046 ''WE'' Chuck Martin ''Law From Back Beyond'' / Roy Manning ''Vengeance Valley'' (1954)
* D-047 ''MY'' Joe Barry ''Kiss And Kill'' / Richard Powell ''On The Hook'' (1954)
* D-048 ''WE'' Louis L'Amour (as Jim Mayo) ''Utah Blaine'' / Brad Ward ''Desert Showdown'' (1954)
* D-049 ''MY'' Dan Cushman ''Tongking! '' / Charles Grayson ''Golden Temptress''
* D-050 ''NA'' Wilene Shaw ''The Mating Call'' / Ozro Grant ''The Bad 'Un'' (1954)
* D-051 ''MY'' Emmett Mcdowell ''Switcheroo'' / Lawrence Treat ''Over The Edge'' (1954)
* D-052 ''WE'' William Colt Macdonald ''Boomtown Buccaneers'' / Louis L'Amour ''Crossfire Trail'' (1954)
* D-053 ''SF'' Murray Leinster ''Gateway to Elsewhere'' / A. E. van Vogt '' The Weapon Shops of Isher'' (1954)
* D-055 ''MY'' Robert Turner ''The Tobacco Auction Murders'' / Michael Stark ''Kill-Box''
* D-056 ''WE'' Bliss Lomax ''Ambush At Coffin Canyon'' / Dwight Bennett Newton (as Clement Hardin) ''Hellbent For A Hangrope'' (1954)
* D-057 ''MY'' A. S. Fleischman ''Counterspy Express'' / M. V. Heberden (as Charles L. Leonard) ''Treachery In Trieste'' (1954)
* D-059 ''MY'' Robert Bloch ''Spiderweb'' / David Alexander ''The Corpse In My Bed'' (1951)
* D-061 ''SF'' L. Sprague de Camp '' Cosmic Manhunt'' / Clifford D. Simak ''Ring Around The Sun'' (1954)
* D-063 ''MY'' Harry Whittington ''You'll Die Next! '' / Frederick C. Davis ''Drag The Dark''
* D-064 ''WE'' Paul Evan Lehman ''Bullets Don't Bluff'' / Chandler Whipple ''Under The Mesa Rim'' (1954)
* D-065 ''MY'' Edward Kimbrough ''Night Fire'' / Juanita Osborne ''Tornado'' (1954)
* D-068 ''WE'' Walker A. Tompkins ''Deadwood'' / William Hopson ''Bullet-Brand Empire'' (1954)
*D-069 ''SF'' Lewis Padgett (Henry Kuttner) and C. L. Moore) ''Beyond Earth's Gates'' / Andre Norton ''Daybreak—2250 A. D.'' (1954)
*D-071 ''MY'' John Creasey (as Gordon Ashe) ''Drop Dead! '' / Margaret Scherf ''The Case Of The Hated Senator'' (1954)
*D-072 ''WE'' Ralph R. Perry ''Night Rider Deputy'' / Norman A. Fox ''The Devil's Saddle'' (1954)
*D-073 ''SF'' Donald A. Wollheim (ed.) ''Adventures in the Far Future'' / Donald A. Wollheim (ed.) ''Tales of Outer Space'' (1954)
*D-077 ''MY'' Leigh Brackett (as George Sanders) ''Stranger At Home'' / Stephen Marlowe ''Catch The Brass Ring'' (1954)
*D-078 ''WE'' Nelson Nye ''The One-Shot Kid'' / Tom West ''Lobo Legacy'' (1954)
*D-079 ''SF'' Francis Rufus Bellamy ''Atta'' / Murray Leinster ''The Brain Stealers'' (1954)
*D-081 ''MY'' John A. Saxon ''Liability Limited'' / Sheldon Stark ''Too Many Sinners''
*D-084 ''SF'' Isaac Asimov '' The Rebellious Stars'' / Roger Dee ''An Earth Gone Mad'' (1954)
*D-086 ''WE'' Richard Brister ''The Shoot-Out At Sentinel Peak'' / Roy Manning ''Tangled Trail'' (1954)
*D-089 ''MY'' Stephen Marlowe ''Turn Left For Murder'' / Ruth Wilson and Alexander Wilson ''Death Watch'' (1955)
*D-092 ''WE'' Burt Arthur ''The Drifter'' / Richard Wormser and Dan Gordon ''The Longhorn Trail'' (1955)
*D-094 ''SF'' Murray Leinster ''The Other Side of Here'' / A. E. van Vogt '' One Against Eternity'' (1955)
*D-096 ''SF'' Andre Norton (as Andrew North) '' The Last Planet'' / Alan E. Nourse ''A Man Obsessed'' (1955)
*D-098 ''WE'' Nelson Nye ''Texas Tornado'' / Samuel A. Peeples (as Samuel Anthony Peeples) ''The Lobo Horseman'' (1955)
*D-099 ''SF'' Robert Moore Williams ''Conquest of the Space Sea'' / Leigh Brackett '' The Galactic Breed'' (1955)
*D-101 ''MY'' Jack Karney ''Knock 'Em Dead'' / Hal Braham (as Mel Colton) ''Point Of No Escape''
*D-103 ''SF'' Philip K. Dick '' Solar Lottery'' / Leigh Brackett ''The Big Jump'' (1955)
*D-106 ''WE'' D. L. Bonar ''Lawman Without A Badge'' / Lee Floren ''Four Texans North'' (1955)
*D-109 ''MY'' Dale Clark ''Mambo To Murder'' / Sterling Noel ''I See Red'' (1955)
*D-110 ''SF'' Isaac Asimov '' The 1000 Year Plan'' / Poul Anderson ''No World of Their Own'' (1955)
*D-112 ''WE'' Frank Castle ''Border Buccaneers'' / Harry Sinclair Drago ''Trigger Gospel'' (1955)
*D-113 ''SF'' Dwight V. Swain ''The Transposed Man'' / J. T. McIntosh ''One in 300'' (1955)
*D-115 ''MY'' Harry Whittington ''One Got Away'' / Cleve F. Adams ''Shady Lady'' (1955)
*D-118 ''SF'' Charles L. Harness ''The Paradox Men'' / Jack Williamson ''Dome Around America'' (1955)
*D-120 ''WE'' John Mcgreevey ''Bounty Man'' / Samuel A. Peeples (as Samuel Anthony Peeples) ''The Call Of The Gun''
*D-121 ''SF'' Andre Norton '' The Stars are Ours!'' / Sam Merwin, Jr. ''Three Faces of Time'' (1955)
*D-123 ''MY'' Gil Brewer ''The Squeeze'' / Frank Diamond ''Love Me To Death'' (1955)
*D-128 ''WE'' William Hopson ''High Saddle'' / William E. Vance ''Way Station West'' (1955)
*D-129 ''MY'' Day Keene ''The Dangling Carrot'' / Norman C. Rosenthal ''Silenced Witnesses'' (1955)
*D-134 ''WE'' Gene Olsen ''The Outsiders'' / Nelson Nye ''Tornado On Horseback'' (1955)
*D-135 ''MY'' Milton K. Ozaki ''Maid For Murder'' / Rene Brabazon Raymond (as James Hadley Chase) ''Dead Ringer'' (1955)
*D-138 ''WE'' Paul Evan ''Gunsmoke Over Sabado'' / T. V. Olsen ''Haven Of The Hunted'' (1956)
*D-139 ''SF'' Nick Boddie Williams ''The Atom Curtain'' / Gordon R. Dickson ''Alien From Arcturus'' (1956)
*D-144 ''WE'' Jay Albert ''The Man From Stony Lonesome'' / Rod Patterson ''A Killer Comes Riding'' (1956)
*D-146 ''SF'' Lee Correy ''Contraband Rocket'' / Murray Leinster ''The Forgotten Planet'' (1956)
*D-147 ''MY'' Gregory Jones ''Prowl Cop'' / Norman Herries ''My Private Hangman'' (1956)
*D-149 ''MY'' Ronald Kayser (as Dale Clark) ''A Run For The Money'' / Mark Macklin ''The Thin Edge Of Mania'' (1955)
*D-150 ''SF'' Philip K. Dick ''The World Jones Made'' / Margaret St. Clair ''Agent of the Unknown'' (1956)
*D-156 ''WE'' Lee Floren ''Thruway West'' / Stephen C. Lawrence ''The Naked Range'' (1956)
*D-157 ''MY'' Louis Trimble ''Stab In The Dark'' / Jonathon Gant ''Never Say No To A Killer''
*D-160 ''WE'' Karl Kramer ''Action Along The Humboldt'' / Michael Carder ''Decision At Sundown''
*D-162 ''SF'' Jerry Sohl ''The Mars Monopoly'' / R. DeWitt Miller and Anna Hunger ''The Man Who Lived Forever'', (1956)
*D-164 ''SF'' Gordon R. Dickson ''Mankind on The Run'' / Andre Norton ''The Crossroads of Time'' (1956)
*D-166 ''WE'' Samuel A. Peeples (as Samuel Anthony Peeples) ''Terror At Tres Alamos'' / Louis Trimble, Stuart Brock ''Whispering Canyon''
*D-167 ''MY'' Milton K. Ozaki ''Never Say Die'' / John Creighton (author), John Creighton ''Destroying Angel'' (1956)
*D-170 ''MY'' Day Keene ''Flight By Night'' / Lawrence Goldman (author), Lawrence Goldman ''Black Fire''
*D-172 ''WE'' Robert J. Steelman ''Stages South'' / Ben Smith (author), Ben Smith ''Johnny No-Name'' (1956)
*D-173 ''SF'' Ray Cummings ''The Man Who Mastered Time'' / Joseph E. Kelleam ''Overlords of Space'' (1956)
*D-176 ''SF'' Thomas Calvert McClary ''Three Thousand Years'' / Margaret St. Clair ''The Green Queen'' (1956)
*D-177 ''MY'' Stephen Marlowe (as C.H. Thames) ''Violence Is Golden'' / Robert Turner ''The Girl In The Cop's Pocket'' (1956)
*D-180 ''WE'' Nelson C. Nye ''The No-Gun Fighter'' / Walt Coburn ''One Step Ahead Of The Posse'' (1956)
*D-182 ''NA'' Émile Zola ''Shame'' / ''Thérèse Raquin'' (1956)
*D-185 ''MY'' Geoffrey Holmes (author), Geoffrey Holmes ''Build My Gallows High'' / Harry Whittington ''The Humming Box'' (1956)
*D-186 ''WE'' Ray Hogan (author), Ray Hogan ''Ex-Marshall'' / Edward Churchill (author), Edward Churchill ''Steel Horizon'' (1956)
*D-189 ''MY'' Lawrence Treat ''Weep For A Wanton'' / Stephen Marlowe ''Dead On Arrival'' (1956)
*D-192 ''WE'' Roy Manning ''Beware Of This Tenderfoot'' / John Callahan ''Bad Blood At Black Range'' (1956)
*D-193 ''SF'' Philip K. Dick ''The Man Who Japed'' / Edwin Charles Tubb, E. C. Tubb ''The Space-Born'' (1956)
*D-195 ''MY'' Robert Colby (writer), Robert Colby ''The Quaking Widow'' / Dudley Dean Macgaughy (as Owen Dudley) ''The Deep End''
*D-196 ''WE'' Walt Coburn ''The Night Branders'' / Frank Gruber ''The Highwayman''
*D-197 ''MY'' James Byron (writer), James Byron ''TNT For Two'' / Charles Weiser Frey (as Ferguson Findley) ''Counterfeit Corpse'' (1956)
*D-199 ''SF'' Poul Anderson ''Question and Answer (novel), Planet of No Return'' / Andre Norton ''Star Guard'' (1956)
*D-201 ''MY'' Harry Whittington ''Across That River'' / Nathaniel E. Jones ''Saturday Mountain'' (1957)
*D-203 ''MY'' William Grote ''Cain's Girlfriend'' / William L. Rohde ''Uneasy Lies The Head'' (1957)
*D-204 ''WE'' Paul Durst ''John Law, Keep Out! '' / Gordon Donalds ''The Desperate Donigans'' (1957)
*D-205 ''SF'' Donald A. Wollheim (ed.) ''The Earth in Peril'' / Lan Wright ''Who Speaks of Conquest?'' (1957)
*D-208 ''WE'' Glenn Balch ''Blind Man's Bullets'' / Barry Cord ''The Prodigal Gun'' (1957)
*D-209 ''MY'' John Jake ''A Night For Treason'' / F. L. Wallace ''Three Times A Victim'' (1957)
*D-215 ''SF'' Eric Frank Russell ''Three To Conquer'' / Robert Moore Williams ''Doomsday Eve'' (1957)
*D-216 ''WE'' Peter B. Germano, Barry Cord ''Savage Valley'' / William Colt Macdonald ''Ridin' Through'' (1957)
*D-217 ''MY'' Bob McKnight (writer), Bob McKnight ''Downwind'' / B. E. Lovell ''A Rage To Kill'' (1957)
*D-220 ''WE'' Ray Hogan (author), Ray Hogan ''The Friendless One'' / John Jakes ''Wear A Fast Gun'' (1956)
*D-221 ''MY'' Gordon Ashe ''You've Bet Your Life'' / Robert Chavis ''Terror Package'' (1957)
*D-223 ''SF'' Robert Silverberg ''The 13th Immortal'' / James Gunn (author), James E. Gunn ''This Fortress World'' (1957)
*D-225 ''MY'' Kendell Foster Crossen (as M. E. Chaber) ''A Lonely Walk'' / Harry Giddings ''Loser By A Head'' (1957)
*D-226 ''WE'' Edwin Booth (author), Edwin Booth ''Showdown At Warbird'' / Samuel A. Peeples ''Doc Colt'' (1957)
*D-227 ''SF'' H. Beam Piper and John J. McGuire ''Crisis in 2140'' / Cyril Judd (Cyril M. Kornbluth and Judith Merril) ''Gunner Cade'' (1957)
*D-230 ''WE'' Peter B. Germano, Barry Cord ''Boss Of Barbed Wire'' / Lee Floren ''Burn 'Em Out! '' (1957)
*D-231 ''MY'' Dudley Dean Macgaughy (as Owen Dudle) ''Murder For Charity'' / Edward S. Aarons (as Edward Ronn) ''Point Of Peril'' (1957)
*D-235 ''MY'' John Alfred "Jack" Webb, Jack Webb (as John Farr) ''The Lady And The Snake'' / Louis Trimble ''Nothing To Lose But My Life'' (1957)
*D-236 ''WE'' Edwin Booth (writer), Edwin Booth ''Jinx Rider'' / Ray Hogan (author), Ray Hogan ''Walk A Lonely Trail'' (1957)
*D-237 ''SF'' Robert Silverberg ''Master of Life and Death'' / James White (author), James White ''The Secret Visitors'' (1957)
*D-240 ''WE'' Wayne C. Lee ''Broken Wheel Ranch'' / Tom West ''Torture Trail'' (1957)
*D-241 ''MY'' Harry Whittington ''One Deadly Dawn'' / Wilson Tucker (writer), Wilson Tucker ''The Hired Target'' (1957)
*D-242 ''SF'' A. E. van Vogt ''Empire of the Atom'' / Frank Belknap Long ''Space Station 1'' (1957)
*D-247 ''MY'' Ken Lewis (author), Ken Lewis ''Look Out Behind You'' / John Creighton (author), John Creighton ''Not So Evil As Eve'' (1957)
*D-248 ''WE'' Dwight Bennett Newton (as Clement Hardin) ''Longhorn Law'' / Ray Hogan (author), Ray Hogan ''Cross Me In Gunsmoke'' (1957)
*D-249 ''SF'' Philip K. Dick ''The Cosmic Puppets'' / Andre Norton (as Andrew North) ''Sargasso of Space'' (1957)
*D-252 ''WE'' John Callahan ''The Rawhide Breed'' / Rod Patterson ''Prairie Terror'' (1957)
*D-253 ''MY'' Bruce Cassiday ''The Buried Motive'' / Prentice Winchell (as Spencer Dean) ''Marked Down For Murder'' (1957)
*D-255 ''SF'' Kenneth Bulmer ''City Under the Sea'' / Poul Anderson ''Star Ways'' (1957)
*D-259 ''MY'' Michael Avallone ''The Case Of The Violent Virgin'' / ''The Case Of The Bouncing Betty'' (1957)
*D-260 ''WE'' Ray Hogan (author), Ray Hogan and Matt Slade (author), Matt Slade ''Land Of The Strangers'' / Lee Floren ''The Saddle Wolves'' (1957)
*D-264 ''WE'' Peter B. Germano, Barry Cord ''Cain Basin'' / Lee E. Wells ''Brother Outlaw'' (1958)
*D-265 ''MY'' Robert Bloch ''Shooting Star'' / Robert Bloch ''Terror In The Night (And Other Stories) ''
*D-266 ''SF'' Edwin Charles Tubb, E. C. Tubb ''The Mechanical Monarch'' / Charles L. Fontenay ''Twice Upon A Time'' (1958)
*D-272 ''WE'' Lee Floren ''Riders In The Night'' / William Hopson ''Backlash At Cajon Pass''
*D-273 ''MY'' Ernest Jason Fredericks ''Shakedown Hotel'' / John Roscoe and Michael Roscoe (as Mike Roscoe) ''The Midnight Eye'' (1958)
*D-276 ''WE'' Peter B. Germano, Barry Cord ''The Gunsmoke Trail'' / Tom West ''Lead In His Fists'' (1958)
*D-277 ''SF'' Murray Leinster ''City on The Moon'' / Donald A. Wollheim (ed.) ''Men on The Moon'' (1958)
*D-279 ''MY'' J. Harvey Bond ''Bye Bye, Baby! '' / Bob McKnight (writer), Bob McKnight ''Murder Mutuel''
*D-284 ''WE'' Peter B. Germano, Barry Cord ''The Guns Of Hammer'' / Edwin Booth (writer), Edwin Booth ''The Man Who Killed Tex'' (1958)
*D-285 ''MY'' Bruce Cassiday ''Brass Shroud'' / Joseph Linklater ''Odd Woman Out'' (1958)
*D-286 ''SF'' Robert Silverberg ''Invaders From Earth'' / Donald A. Wollheim (as David Grinnell) ''Across Time'' (1958)
*D-288 ''WE'' Edwin Booth (writer), Edwin Booth ''Trail To Tomahawk'' / John Callhan ''Land Beyond The Law''
*D-289 ''MY'' Alan Payne (author), Alan Payne ''This'll Slay You'' / John Hawkins (author), John Hawkins and Ward Hawkins ''Violent City''
*D-291 ''SF'' Robert Silverberg (as Calvin M. Knox) ''Lest We forget Thee, Earth'' / Raymond Z. Gallun ''People Minus X'' (1958)
*D-294 ''WE'' John H. Latham ''Bad Bunch Of The Brasada'' / Walt Coburn ''Beyond The Wide Missouri'' (1958)
*D-295 ''SF'' Jack Vance ''Big Planet'' / ''The Slaves of The Klau'' (1958)
*D-297 ''MY'' Peter Rabe ''The Cut Of The Whip'' / Robert Kelston ''Kill One, Kill Two'' (1958)
*D-298 ''WE'' Paul Evans ''Thunder Creek Range'' / William E. Vance ''Outlaws Welcome! '' (1958)
*D-299 ''SF'' Andre Norton ''Star Born'' / H. Beam Piper and John J. McGuire ''A Planet For Texans'' (1958)
*D-301 ''MY'' John Alfred "Jack" Webb, Jack Webb (as John Farr) ''The Deadly Combo'' / Russ Winterbotham (as J. Harvey Bond) ''Murder Isn't Funny'' (1958)
*D-303 ''SF'' Poul Anderson ''The Snows of Ganymede'' / ''War of the Wing-Men'' (1958)
*D-304 ''WE'' Archie Joscelyn ''River To The Sunset'' / Ben Smith (author), Ben Smith ''Trouble At Breakdam'' (1958)
*D-305 ''MY'' Vic Rodell ''Free-Lance Murder'' / Louis King ''Cornered'' (1958)
*D-308 ''WE'' Jack M. Bickham ''Gunman's Gamble'' / Roy Manning ''Draw And Die! '' (1958)
*D-311 ''SF'' Robert Silverberg ''Stepsons of Terra'' / Lan Wright ''A Man Called Destiny'' (1958)
*D-313 ''MY'' Samuel Krasney ''Design For Dying'' / J. M. Flynn ''The Deadly Boodle'' (1958)
*D-315 ''SF'' Eric Frank Russell ''The Space Willies'' / ''Six Worlds Yonder'' (1958)
*D-316 ''WE'' Rod Patterson ''A Time For Guns'' / Peter B. Germano, Barry Cord ''Mesquite Johnny'' (1958)
*D-317 ''MY'' John Creighton (author), John Creighton ''The Wayward Blonde'' / Gerry Travis ''The Big Bite'' (1958)
*D-320 ''WE'' Robert Mccaig ''The Rangemaster'' / William Hopson ''The Last Shoot-Out'' (1958)
*D-321 ''MY'' John Creighton (author), John Creighton ''Trial By Perjury'' / Louis Trimble ''The Smell Of Trouble'' (1958)
*D-322 ''SF'' Robert Moore Williams ''The Blue Atom'' / ''The Void Beyond and Other Stories'' (1958)
*D-328 ''WE'' Merle Constiner ''The Fourth Gunman'' / Tom West ''Slick On The Draw'' (1958)
*D-329 ''MY'' Robert Emmett Mcdowell (as Emmett Mcdowell) ''Stamped For Death'' / Robert Emmett Mcdowell (as Emmett Mcdowell) ''Three For The Gallows'' (1958)
*D-331 ''SF'' Kenneth Bulmer ''The Secret of Zi'' / Ray Cummings ''Beyond the Vanishing Point'' (1958)
*D-332 ''WE'' Kermit Welles ''Blood On Boot Hill'' / Ben Smith (author), Ben Smith ''Stranger In Sundown'' (1959)
*D-333 ''MY'' Mike Brett ''Scream Street'' / John Creighton (author), John Creighton ''Stranglehold'' (1959)
*D-335 ''SF'' Poul Anderson ''The War of Two Worlds'' / John Brunner (novelist), John Brunner ''Threshold of Eternity'' (1959)
*D-345 ''SF'' Andre Norton (as Andrew North) ''Plague Ship'' / ''Voodoo Planet'' (1959)
*D-346 ''WE'' Ray Hogan (author), Ray Hogan ''Wanted: Alive! '' / Peter B. Germano, Barry Cord ''Sherriff Of Big Hat'' (1957)
*D-347 ''MY'' Louis Trimble ''The Corpse Without A Country'' / Harry Whittington ''Play For Keeps'' (1957)
*D-348 ''WE'' T. V. Olsen ''The Man From Nowhere'' / John L. Shelley ''The Avenging Gun'' (1959)
*D-349 ''MY'' Leslie Frederick Brett (as Mike Brett) ''The Guilty Bystander'' / Russell Robert Winterbotham (as J. Harvey Bond) ''Kill Me With Kindness'' (1959)
*D-351 ''SF'' Edmond Hamilton ''The Sun Smasher'' / Robert Silverberg (as Ivar Jorgenson) ''Starhaven'' (1959)
*D-356 ''WE'' Paul Durst ''Kansas Guns'' / Tom West ''The Cactus Kid'' (1958)
*D-357 ''MY'' Lester Dent ''Lady In Peril'' / F. L. Wallace, Floyd Wallace ''Wired For Scandal'' (1959)
*D-358 ''SF'' Robert Silverberg (as Calvin M. Knox) ''The Plot Against Earth'' / Stephen Marlowe, Milton Lesser ''Recruit for Andromeda'' (1959)
*D-360 ''WE'' John H. Latham ''Johnny Sixgun'' / Peter B. Germano, Barry Cord ''War In Peaceful Valley'' (1959)
*D-361 ''MY'' James P. Duff ''Dangerous To Know'' / Robert Colby (writer), Robert Colby ''Murder Mistress'' (1959)
*D-362 ''SF'' John Brunner (novelist), John Brunner ''The 100th Millennium'' / Donald A. Wollheim (as David Grinnell) ''Edge of Time'' (1959)
*D-367 ''MY'' Louis Trimble ''Till Death Do Us Part'' / Charles E. Fritch ''Negative Of A Nude'' (1959)
*D-368 ''WE'' Ray Hogan (author), Ray Hogan ''Hangman's Valley'' / Joseph Gage ''A Score To Settle'' (1959)
*D-369 ''SF'' Brian Aldiss, Brian W. Aldiss ''Vanguard From Alpha'' / Kenneth Bulmer ''The Changeling Worlds'' (1959)
*D-372 ''WE'' Dan Kirby (writer), Dan Kirby ''Cimarron Territory'' / Glenn Balach ''Grass Greed'' (1959)
*D-373 ''MY'' Jack Karney ''The Knave Of Diamonds'' / Doug Warren (author), Doug Warren ''Scarlet Starlet'' (1959)
*D-375 ''SF'' Damon Knight ''Masters of Evolution'' / George O. Smith ''Fire in the Heavens'' (1959)
*D-379 ''MY'' William Woody ''Mistress Of Horror House'' / Jay Flynn (author), Jay Flynn (as J. M. Flynn) ''Drink With The Dead'' (1959)
*D-380 ''WE'' William Heuman ''My Brother The Gunman'' / Barry Cord ''Concho Valley'' (1959)
*D-381 ''SF'' Jerry Sohl ''One Against Herculum'' / Andre Norton ''Secret of the Lost Race'' (1959)
*D-384 ''WE'' Louis Trimble ''Mountain Ambush'' / Jack M. Bickham ''Feud Fury''
*D-385 ''SF'' John Brunner (novelist), John Brunner ''Echo In The Skull'' / Alan E. Nourse ''Rocket To Limbo'' (1959)
*D-387 ''MY'' Laine Fisher ''Fare Prey'' / Bob McKnight (writer), Bob McKnight ''The Bikini Bombshell'' (1959)
*D-391 ''SF'' John Brunner (novelist), John Brunner ''The World Swappers'' / A. E. van Vogt ''Siege of the Unseen'' (1959)
*D-392 ''WE'' Tom West ''Twisted Trail'' / Archie Joscelyn ''The Man From Salt Creek'' (1959)
*D-393 ''MY'' Joseph L. Chadwick (as John Creighton) ''Evil Is The Night'' / Robert A. Levey ''Dictators Die Hard'' (1959)
*D-400 ''WE'' Peter B. Germano, Barry Cord ''Last Chance At Devil's Canyon'' / Gordon D. Shirreffs ''Shadow Of A Gunman'' (1959)
*D-401 ''MY'' Louis Trimble ''Obit Deferred'' / Tedd Thomey ''I Want Out'' (1959)
*D-403 ''SF'' Murray Leinster ''The Mutant Weapon'' / ''The Pirates of Zan'' (1959)
*D-407 ''SF'' Poul Anderson ''We Claim These Stars!'' / Robert Silverberg ''The Planet Killers'' (1959)
*D-408 ''WE'' Edwin Booth (writer), Edwin Booth ''Wyoming Welcome'' / Giles A. Lutz ''Law Of The Trigger'' (1959)
*D-409 ''MY'' Louis Trimble ''Cargo For The Styx'' / Jay Flynn (author), Jay Flynn (as J.M. Flynn) ''Terror Tournament'' (1959)
*D-412 ''WE'' E. A. Alman ''Ride The Long Night'' / Gordon D. Shirreffs ''Apache Butte'' (1959)
*D-413 ''SF'' Harlan Ellison ''The Man With Nine Lives'' / ''A Touch of Infinity'' (1959)
*D-415 ''MY'' Prentice Winchell (as Stewart Sterling) ''Fire On Fear Street'' / ''Dead Certain'' (1960)
*D-418 ''WE'' C. S. Park ''The Quiet Ones'' / Tom West ''Nothing But My Gun'' (1960)
*D-419 ''MY'' Bernard Thielen ''Open Season'' / Bob McKnight (writer), Bob McKnight ''A Slice Of Death'' (1958)
*D-421 ''SF'' Philip K. Dick ''Dr. Futurity'' / John Brunner (novelist), John Brunner ''Slavers of Space'' (1960)
*D-424 ''WE'' Lee Richards (author), Lee Richards ''Shoot Out At The Way Station'' / Robert Mccaig ''Wild Justice'' (1960)
*D-425 ''MY'' Roberta Elizabeth Sebenthal (as Paul Kruger) ''Dig Her A Grave'' / Joseph L. Chadwick (as John Creighton) ''A Half Interest In Murder'' (1960)
*D-427 ''SF'' Robert Moore Williams ''World of the Masterminds'' / ''To the Edge of Time and Other Stories'' (1960)
*D-430 ''WE'' William Hopson ''Born Savage'' / Ray Hogan (author), Ray Hogan ''The Hasty Hangman'' (1960)
*D-431 ''SF'' A. E. van Vogt ''Earth's Last Fortress'' / George O. Smith ''Lost in Space'' (1960)
*D-433 ''MY'' Jack Bradley (author), Jack Bradley ''If Hate Could Kill'' / Talmage Powell ''The Smasher'' (1960)
*D-436 ''WE'' Tom West ''The Phantom Pistoleer'' / Giles A. Lutz ''The Challenger'' (1960)
*D-437 ''SF'' Andre Norton ''The Sioux Spaceman'' / Richard Wilson (author), Richard Wilson ''And Then The Town Took Off'' (1960)
*D-439 ''MY'' Duane Decker ''The Devil's Punchbowl'' / Owen Dudley ''Run If You Can'' (1960)
*D-442 ''WE'' Jack M. Bickham ''Killer's Paradise'' / Rod Patterson ''Rider Of The Rincon'' (1960)
*D-443 ''SF'' Manly Wade Wellman ''The Dark Destroyers'' / Brian Aldiss, Brian W. Aldiss ''Bow Down to Nul'' (1960)
*D-445 ''MY'' Robert Emmett Mcdowell (as Emmett Mcdowell) ''Bloodline To Murder'' / ''In At The Kill'' (1960)
*D-447 ''MY'' Bob McKnight (writer), Bob McKnight ''Kiss The Babe Goodbye'' / J. M. Flynn ''The Hot Chariot'' (1960)
*D-448 ''WE'' Lee Floren ''Pistol-Whipper'' / Archie Joscelyn (as Al Cody) ''Winter Range'' (1960)
*D-449 ''SF'' Gordon R. Dickson ''Dorsai!, The Genetic General'' / ''Time to Teleport'' (1960)
*D-450 ''WE'' Tom West ''Side Me With Sixes'' / Ray Hogan (author), Ray Hogan ''The Ridgerunner'' (1960)
*D-451 ''MY'' Steve Ward (author), Steve Ward ''Odds Against Linda'' / Robert Martin (author), Robert Martin ''A Key To The Morgue'' (1960)
*D-453 ''SF'' Kenneth Bulmer ''The Earth Gods Are Coming'' / Margaret St. Clair ''The Games of Neith'' (1960)
*D-456 ''WE'' Edwin Booth (writer), Edwin Booth ''Danger Trail'' / Edwin Booth (writer), Edwin Booth ''The Desperate Dude''
*D-457 ''SF'' Philip K. Dick ''Vulcan's Hammer'' / John Brunner (novelist), John Brunner ''The Skynappers'' (1960)
*D-459 ''MY'' Howard J. Olmsted ''The Hot Diary'' / J. M. Flynn ''Ring Around A Rogue'' (1960)
*D-462 ''WE'' Jack M. Bickham ''The Useless Gun'' / John H. Latham ''The Long Fuse'' (1960)
*D-463 ''MY'' Prentice Winchell (as Stewart Sterling) ''Dying Room Only'' / ''The Body In The Bed'' (1960)
*D-465 ''SF'' John Brunner (novelist), John Brunner ''The Atlantic Abomination'' / Donald A. Wollheim (as David Grinnell) ''The Martian Missile'' (1960)
*D-469 ''MY'' Bob McKnight (writer), Bob McKnight ''Running Scared'' / Talmage Powell ''Man-Killer'' (1960)
*D-470 ''WE'' Gene Olsen ''The Man Who Was Morgan'' / Ben Smith (author), Ben Smith ''The Maverick'' (1960)
*D-471 ''SF'' John Brunner (novelist), John Brunner ''Sanctuary in the Sky'' / Jack Sharkey (author), Jack Sharkey ''The Secret Martians'' (1960)
*D-476 ''WE'' Tom West ''Double Cross Dinero'' / Edwin Booth (writer), Edwin Booth ''Last Valley'' (1960)
*D-477 ''MY'' Louis Trimble ''The Duchess Of Skid Row'' / ''Love Me And Die'' (1961)
*D-479 ''SF'' Wilson Tucker (writer), Wilson Tucker ''To the Tombaugh Station'' / Poul Anderson ''Earthman Go Home!'' (1960)
*D-483 ''MY'' Russell Robert Winterbotham (as J. Harvey Bond) ''If Wishes Were Hearses'' / Bruce Cassiday ''The Corpse In The Picture Window'' (1961)
*D-484 ''WE'' Ray Hogan (author), Ray Hogan ''Ambush At Riflestock'' / Archie Joscelyn (as Al Cody) ''Dead Man's Spurs'' (1961)
*D-485 ''SF'' Robert A. W. Lowndes ''The Puzzle Planet'' / Lloyd Biggle, Jr. ''The Angry Espers'' (1961)
*D-489 ''MY'' R. Arthur ''Somebody's Walking Over My Grave'' / John Miles Bickham (as John Miles) ''Dally With A Deadly Doll'' (1961)
*D-491 ''SF'' Fritz Leiber ''The Big Time (novel), The Big Time'' / Fritz Leiber ''The Mind-Spider and Other Stories'' (1961)
*D-492 ''WE'' William Hopson ''Winter Drive'' / Giles A. Lutz ''The Wild Quarry'' (1961)
*D-496 ''WE'' Steven G. Lawrence ''With Blood In Their Eyes'' / Tom West ''Killer's Canyon'' (1961)
*D-497 ''SF'' John Brunner (novelist), John Brunner (as Keith Woodcott) ''I Speak For Earth'' / Ray Cummings ''Wandl The Invader'' (1961)
*D-499 ''MY'' Frederick C. Davis ''Night Drop'' / ''High Heel Homicide'' (1961)
*D-502 ''WE'' Paul Evan Lehman ''Troubled Range'' / Archie Joscelyn (as Al Cody) ''Long Night At Lodgepole'' (1961)
*D-505 ''MY'' Louis Trimble ''The Surfside Caper'' / Robert Colby (writer), Robert Colby ''In A Vanishing Room'' (1961)
*D-507 ''SF'' Kenneth Bulmer ''Beyond the Silver Sky'' / John Brunner (novelist), John Brunner ''Meeting At Infinity'' (1961)
*D-509 ''SF'' Andre Norton ''The Beast Master'' / ''Star Hunter'' (1961)
*D-510 ''WE'' Harry Whittington ''The Searching Rider'' / Jack M. Bickham ''Hangman's Territory'' (1961)
*D-511 ''MY'' J. M. Flynn ''One For The Death House'' / Bob McKnight (writer), Bob McKnight ''Drop Dead, Please'' (1961)
*D-514 ''WE'' Gordon D. Shirreffs ''Hangin' Pards'' / Gordon D. Shirreffs ''Ride A Lone Trail'' (1961)
*D-515 ''MY'' Robert Colby (writer), Robert Colby ''Kill Me A Fortune'' / Prentice Winchell (as Stewart Sterling) ''Five Alarm Funeral'' (1961)
*D-517 ''SF'' Clifford D. Simak, Clifford Simak ''The Trouble With Tycho'' / A. Bertram Chandler ''Bring Back Yesterday'' (1961)

F Series

*F-101 ''NA'' Joan Sargent ''Cruise Nurse'' / Margaret Howe (author), Margaret Howe ''Calling Dr. Merriman'' (1960)
*F-102 ''MY'' Bob McKnight (writer), Bob McKnight ''The Flying Eye'' / Clayton Fox ''Never Forget, Never Forgive'' (1961)
*F-103 ''WE'' Harry Whittington ''A Trap For Sam Dodge'' / Lee Floren ''High Thunder'' (1961)
*F-104 ''SF'' Kenneth Bulmer ''No Man's World'' / Poul Anderson ''Mayday Orbit'' (1961)
*F-106 ''WE'' Brian Garfield ''Justice At Spanish Flat'' / Tom West ''The Gun From Nowhere'' (1961)
*F-107 ''MY'' Chester Warwick ''My Pal, The Killer'' / John Trinian ''Scratch A Thief'' (1961)
*F-108 ''SF'' G. McDonald Wallis ''The Light of Lilith'' / Damon Knight ''The Sun Saboteurs'' (1961)
*F-110 ''WE'' Ray Hogan (author), Ray Hogan ''Track The Man Down'' / Lee Wells (writer), Lee Wells ''Savage Range'' (1961)
*F-111 ''MY'' J. M. Flynn ''The Girl From Las Vegas'' / Robert Martin (author), Robert Martin ''To Have And To Kill'' (1960)
*F-112 ''NA'' Jeanne Judson ''Barbara Ames - Private Secretary'' / Nell Marr Dean Ratzlaff (as Nell Marr Dean) ''Fashions For Carol'' (1961)
*F-113 ''SF'' Charles L. Fontenay ''Rebels of The Red Planet'' / J. T. McIntosh ''200 Hundred Years to Christmas'' (1961)
*F-115 ''MY'' John Creighton (author), John Creighton ''The Blonde Cried Murder'' / Fletcher Flora ''Killing Cousins'' (1961)
*F-116 ''WE'' Dwight Bennett Newton (as Clement Hardin) ''The Lurking Gun'' / Louis Trimble ''Deadman Canyon'' (1961)
*F-117 ''SF'' Marion Zimmer Bradley ''The Door Through Space'' / A. Bertram Chandler ''Rendezvous on a Lost World'' (1961)
*F-119 ''SF'' Gordon R. Dickson ''Spacial Delivery'' / ''Delusion World'' (1961)
*F-120 ''WE'' Jack M. Brickham ''Gunman Can't Hide'' / John Callahan ''Come In Shooting'' (1961)
*F-121 ''MY'' Helen Nielson ''Sing Me A Murder'' / Helen Nielson ''Woman Missing And Other Stories'' (1961)
*F-122 ''NA'' Dorothy Worley ''Dr. Kilbourne Comes Home'' / Patti Stone ''Calling Nurse Linda'' (1961)
*F-123 ''SF'' Robert Silverberg ''Collision Course (Silverberg novel), Collision Course'' / Leigh Brackett ''Shadow Over Mars, The Nemesis From Terra'' (1961)
*F-124 ''WE'' Steven G. Lawrence ''Slatterly'' / Steven G. Lawrence ''Bullet Welcome For Slatterly'' (1961)
*F-125 ''MY'' J. M. Flynn ''Deep Six'' / Frank Diamond ''The Widow Maker'' (1961)
*F-126 ''WE'' Edwin Booth (writer), Edwin Booth ''The Troublemaker'' / Ray Hogan (author), Ray Hogan ''A Marshall For Lawless'' (1962)
*F-127 ''SF'' Marion Zimmer Bradley ''Seven From The Stars'' / Keith Laumer ''Worlds Of The Imperium'' (1962)
*F-128 ''WE'' Tom West ''The Buzzard's Nest'' / Louis Trimble ''Siege At High Meadow'' (1962)
*F-129 ''SF'' William F. Temple ''The Automated Goliath'' / William F. Temple ''The Three Suns Of Amara'' (1962)
*F-130 ''MY'' J. M. Flynn ''The Screaming Cargo'' / James A. Howard ''The Bullet-Proof Martyr'' (1961)
*F-133 ''SF'' John Brunner (novelist), John Brunner ''Secret Agent of Terra'' / A. Bertram Chandler ''The Rim of Space'' (1962)
*F-134 ''WE'' Rod Patterson ''A Shooting At Sundust'' / Gordon D. Shirreffs ''Tumbleweed Trigger'' (1962)
*F-138 ''WE'' Steven G. Lawrence ''Walk A Narrow Trail'' / Steven G. Lawrence ''A Noose For Slattery'' (1962)
*F-139 ''SF'' Poul Anderson ''The Makeshift Rocket''/''Un-Man and Other Stories'' (1962)
*F-141 ''SF'' Robert Moore Williams ''The Darkness Before Tomorrow'' / John Brunner (novelist), John Brunner (as Keith Woodcott) ''The Ladder In The Sky'' (1962)
*F-142 ''WE'' L. P. Holmes ''Wolf Brand'' / ''Smoky Pass'' (1962)
*F-143 ''MY'' Bob McKnight (writer), Bob McKnight ''A Stone Around Her Neck'' / Clayton Fox ''End Of A Big Wheel'' (1962)
*F-144 ''WE'' Brian Garfield (as Frank Wynne) ''Massacre Basin'' / Dwight Bennett Newton (as Clement Hardin) ''The Badge Shooters'' (1962)
*F-145 ''SF'' Robert Silverberg ''Next Stop The Stars'' / ''The Seed of Earth'' (1962)
*F-147 ''SF'' Andre Norton ''The Sea Siege'' / ''The Eye of The Monster'' (1962)
*F-148 ''WE'' Harry Whittington ''Wild Sky'' / Tom West ''Dead Man's Double Cross'' (1962)
*F-149 ''SF'' Robert Moore Williams / Charles de Vet (1962)
*F-150 ''WE'' Nelson Nye ''Hideout Mountain'' / ''Rafe'' (1962)
*F-152 ''WE'' Gordon D. Shirreffs ''Rio Desperado'' / ''Voice Of The Gun'' (1962)
*F-153 ''SF'' Marion Zimmer Bradley ''The Sword of Aldones'' / ''The Planet Savers'' (1962)
*F-155 ''MY'' Lionel White ''A Death At Sea'' / ''The Time Of Terror'' (1961)
*F-160 ''WE'' Ray Hogan (author), Ray Hogan ''New Gun For Kingdom City'' / ''The Shotgunner'' (1962)
*F-161 ''SF'' John Brunner (novelist), John Brunner ''Times Without Number'' / Donald A. Wollheim (as David Grinnell) ''Destinies Orbit'' (1962)
*F-164 ''WE'' Steven G. Lawrence ''Longhorns North'' / ''Slattery's Gun Says "No"'' (1962)
*F-165 ''SF'' Philip José Farmer ''Cache From Outer Space'' / ''The Celestial Blueprint'' (1962)
*F-166 ''MY'' Georges Simenon ''Maigret And The Reluctant Witness'' / ''Maigret Has Scruples'' (1962)
*F-172 ''WE'' Tom West ''Battling Buckeroos'' / Giles A. Lutz ''Gun Rich'' (1962)
*F-173 ''SF'' James White (author), James White ''Second Ending'' / Samuel R. Delany '' The Jewels of Aptor'' (1962)
*F-176 ''WE'' Dan J. Stevens ''Gun Trap At Bright Water'' / Ray Hogan (author), Ray Hogan ''The Outside Gun'' (1963)
*F-177 ''SF'' Terry Carr ''Warlord of Kor'' / Robert Moore Williams ''The Star Wasps'' (1963)
*F-184 ''WE'' Nelson C. Nye ''Death Valley Slim'' / ''The Kid From Lincoln County'' (1963)
*F-185 ''SF'' Jack Vance ''The Five Gold Bands'' / ''The Dragon Masters'' (1963)
*F-186 ''WE'' William O. Turner ''The High Hander'' / Louis Trimble ''Wild Horse Range'' (1963) (may be misprinted as F-185 on some copies)
*F-187 ''SF'' Leigh Brackett '' Alpha-Centauri or Die'' / G. MacDonald Wallis ''Legend of Lost Earth'' (1963)
*F-195 ''SF'' Robert Silverberg ''The Silent Invaders'' / William F. Temple ''Battle on Venus'' (1963)
*F-196 ''WE'' Harry Whittington ''Dry Gulch Town'' / ''Prairie Raiders'' (1963)
*F-199 ''SF'' John Brunner (novelist), John Brunner (as Keith Woodcott) ''The Psionic Menace'' / Samuel R. Delany ''Captives of the Flame'' (1963)
*F-200 ''WE'' Tom West ''Triggering Texan'' / Brian Garfield (as Frank Wynne) ''The Big Snow'' (1963)
*F-208 ''WE'' L. P. Holmes ''Side Me At Sundown'' / ''The Buzzards Of Rocky Pass''
*F-209 ''SF'' Kenneth Bulmer, Ken Bulmer ''The Wizard of the Starship Poseidon'' / Poul Anderson ''Let The Spacemen Beware!'' (1963)
*F-214 ''WE'' Louis Trimble ''The Man From Colorado'' / Bill Burchardt ''The Wildcatters'' (1963)
*F-215 ''SF'' John Brunner (novelist), John Brunner ''Listen! The Stars'' / Jane Roberts ''The Rebellers'' (1963)
*F-223 ''SF'' Keith Laumer ''Envoy to New Worlds'' / Robert Moore Williams ''Flight From Yesterday'' (1963)
*F-224 ''WE'' Nelson Nye ''Bancroft's Banco'' / ''The Seven Six-Gunners'' (1963)
*F-227 ''SF'' John Brunner (novelist), John Brunner ''The Astronauts Must Not Land'' / ''The Space-Time Juggler'' (1963)
*F-229 ''MY'' Louis Trimble ''The Dead And The Deadly'' / Bob McKnight (writer), Bob McKnight ''Homicide Handicap'' (1963)
*F-230 ''WE'' Tom West ''Lobo Lawman'' / Ray Hogan (author), Ray Hogan ''Trail Of The Fresno Kid'' (1963)
*F-237 ''SF'' A. Bertram Chandler ''The Ship From Outside'' / ''Beyond the Galactic Rim'' (1963)
*F-238 ''WE'' Stephen Payne (author), Stephen Payne ''Brand Him Outlaw'' / Gordon D. Shirreffs ''Quicktrigger'' (1963)
*F-242 ''SF'' John Brunner (novelist), John Brunner ''The Rites of Ohe'' / ''Castaway World'' (1963)
*F-244 ''WE'' Ray Hogan (author), Ray Hogan ''Last Gun At Cabresto'' / Edwin Booth (writer), Edwin Booth ''Valley Of Violence'' (1962)
*F-249 ''SF'' L. Sprague de Camp ''The Hand of Zei''/''The Search for Zei'' (1963)
*F-250 ''WE'' Peter B. Germano, Barry Cord ''The Masked Gun'' / Tom West ''Gallows Gulch'' (1963)
*F-253 ''SF'' Robert Silverberg (as Calvin M. Knox) ''One of Our Asteroids is Missing'' / A. E. van Vogt ''The Twisted Men'' (1964)
*F-254 ''WE'' Philip Ketchum ''The Ghost Riders'' / William Heuman ''Hardcase Halloran'' (1964)
*F-260 ''WE'' Louis Trimble ''Trouble At Gunsight'' / Brian Garfield ''Trail Drive''
*F-261 ''SF'' Samuel R. Delany ''The Towers of Toron'' / Robert M. Williams ''The Lunar Eye'' (1964)
*F-264 ''WE'' Ben Elliott (author), Ben Elliott ''Contract In Cartridges'' / Tom West ''Don't Cross My Line'' (1964)
*F-265 ''SF'' Jack Vance ''The Houses of Iszm'' / ''Son of The Tree'' (1964)
*F-272 ''WE'' Ray Hogan (author), Ray Hogan ''The Man From Barranca Negra'' / Stephen Payne ''No Job For A Cowboy'' (1964)
*F-273 ''SF'' Marion Zimmer Bradley ''Falcons of Narabedla'' / ''The Dark Intruder'' (1964)
*F-275 ''SF'' Philip E. High ''No Truce With Terra'' / Murray Leinster ''The Duplicators'' (1964)
*F-276 ''WE'' Brian Garfield (as Brian Wynne) ''Mr. Six Gun'' / William E. Vance ''The Wolf Slayer'' (1964)
*F-284 ''WE'' Lin Searles ''Border Passage'' / Ben Smith (author), Ben Smith ''The Homesteader'' (1964)
*F-285 ''SF'' Fritz Leiber ''Ships to the Stars'' / Kenneth Bulmer, Ken Bulmer ''The Million Year Hunt'' (1964)
*F-289 ''SF'' Kenneth Bulmer, Ken Bulmer ''Demons' World'' / Tom Purdom ''I Want the Stars'' (1964)
*F-292 ''WE'' Gordon D. Shirreffs ''The Hidden Rider Of Dark Mountain'' / Tom West ''The Man At Rope's End'' (1964)
*F-298 ''WE'' Nelson Nye ''Treasure Trail From Tucson'' / ''Sudden Country'' (1964)
*F-299 ''SF'' John Brunner (novelist), John Brunner ''Endless Shadow''/ Gardner Fox ''The Arsenal of Miracles'' (1964)

M Series

*M-100 ''WE'' John Callahan ''A Man Named Raglan'' / Peter B. Germano, Barry Cord ''Gun Junction'' (1964)
*M-101 ''SF'' Leigh Brackett ''The Secret of Sinharat'' / ''People of the Talisman'' (1964)
*M-102 ''WE'' Ray Hogan (author), Ray Hogan ''Hoodoo Guns'' / Rod Patterson ''Trouble At Hangdog Flats'' (1964)
*M-103 ''SF'' Fred Saberhagen ''The Golden People'' / Lan Wright ''Exile From Xanadu'' (1964)
*M-104 ''WE'' Tom West ''Sidewinder Showdown'' / Dan J. Stevens ''Land Beyond The Law''
*M-105 ''SF'' Margaret St. Clair ''Message From the Eocene'' / ''Three Worlds of Futury'' (1964)
*M-106 ''WE'' Reese Sullivan ''The Blind Trail'' / Tim Kelly (author), Tim Kelly ''Ride Of Fury'' (1964)
*M-107 ''SF'' A. Bertram Chandler ''The Coils of Time'' / ''Into The Alternate Universe'' (1964)
*M-108 ''WE'' Rod Patterson ''Gunfire Heritage'' / Wayne C. Lee ''Warpath West'' (1965)
*M-109 ''SF'' G. C. Edmondson ''Stranger Than You Think'' / ''The Ship That Sailed the Time Stream'' (1965)
*M-110 ''WE'' Tom West ''Bushwack Brand'' / Merle Constiner ''Wolf On Horseback'' (1965)
*M-111 ''SF'' Edmond Hamilton ''Fugitive of the Stars'' / Kenneth Bulmer ''Land Beyond the Map'' (1965)
*M-112 ''WE'' Nelson Nye ''Rogue's Rendezvous'' / ''Gun Feud At Tiedown''
*M-113 ''SF'' Damon Knight ''Off Center'' / ''The Rithian Terror'' (1965)
*M-114 ''WE'' Brian Garfield (as Frank Wynne) ''Lynch Law Canyon'' / Stephen Payne ''Stampede On Farway Pass''
*M-115 ''SF'' John Brunner (novelist), John Brunner ''The Repairmen of Cyclops'' / ''Enigma From Tantalus'' (1965)
*M-117 ''SF'' Bruce W. Ronald ''Our Man in Space'' / Jack Sharkey (author), Jack Sharkey ''Ultimatum in 2050 A.D.'' (1965)
*M-118 ''WE'' Merle Constiner ''Guns At Q Cross'' / Tom West ''The Toughest Town In The Territory'' (1965)
*M-120 ''WE'' Nelson Nye ''Ambush At Yuma's Chimney'' / John Callahan ''Ride The Wild Land'' (1965)
*M-121 ''SF'' Emil Petaja ''Alpha Yes, Terra No!'' / Samuel R. Delany ''The Ballad of Beta-2'' (1965)
*M-122 ''WE'' Roger G. Spellman ''Tall For A Texan'' / William E. Vance, William Vance ''Outlaw Brand'' (1965)
*M-123 ''SF'' John Brunner (novelist), John Brunner ''The Altar on Asconel'' / Ted White (author), Ted White ''Android Avenger'' (1965)
*M-124 ''WE'' Stephen Payne ''Trail Of The Vanishing Ranchers'' / Tom West ''Battle At Rattlesnake Pass'' (1965)
*M-125 ''SF'' Jack Vance ''Monsters in Orbit'' / ''The World Between and Other Stories'' (1965)
*M-126 ''WE'' Harry Whittington ''Valley Of Savage Men'' / Ben Elliott (author), Ben Elliott ''Brother Badman'' (1965)
*M-127 ''SF'' John Rackham (author), John Rackham ''We, The Venusians'' / Fred Saberhagen ''The Water of Thought'' (1965)
*M-128 ''WE'' Brian Garfield (as Brian Wynne) ''The Night It Rained Bullets'' / Reese Sullivan ''Nemesis Of Circle A'' (1965)
*M-129 ''SF'' A. Bertram Chandler ''The Alternate Martians'' / A. Bertram Chandler ''Empress of Outer Space'' (1965)
*M-130 ''WE'' John Callahan ''Half-Injun, Half-Wildcat'' / Clement Hardin ''Outcast Of Ute Bend'' (1965)
*M-131 ''SF'' Kenneth Bulmer ''Behold The Stars'' / Mack Reynolds ''Planetary Agent X'' (1965)
*M-133 ''SF'' A. Bertram Chandler ''Space Mercenaries'' / Emil Petaja ''The Caves of Mars'' (1965)
*M-134 ''WE'' Tom West ''Lost Loot Of Kittycat Ranch'' / Lin Searles ''Saddle The Wind'' (1965)
*M-135 ''SF'' Philip E. High ''The Mad Metropolis'' / Murray Leinster ''Space Captain'' (1966)
*M-136 ''WE'' Ray Hogan (author), Ray Hogan ''Panhandle Pistolero'' / Nelson Nye ''The Marshall Of Pioche'' (1966)
*M-138 ''WE'' Brian Garfield (as Frank Wynne) ''Call Me Hazard'' / Dean Owens ''The Rincon Trap'' (1966)
*M-139 ''SF'' Samuel R. Delany ''Empire Star'' / Tom Purdom ''The Tree Lord of Imeton'' (1966)
*M-140 ''WE'' Reese Sullivan ''Deadly Like A .45'' / Peter B. Germano, Barry Cord ''Last Stage To Gomorrah'' (1966)
*M-141 ''SF'' Jack Vance ''The Brains of Earth'' / ''The Many Worlds of Magnus Ridolph'' (1966)

G Series

*G-501 ''MY'' Charlotte Armstrong Lewi (as Charlotte Armstrong) ''Incident At A Corner'' / ''The Unsuspected (novel), The Unsuspected'' (1965)
*G-503 ''MY'' Ursula Curtiss ''The Face Of The Tiger'' / ''The Stairway'' (1962)
*G-506 ''MY'' Doris Miles Disney ''Black Mail'' / ''Did She Fall Or Was She Pushed? ''
*G-508 ''MY'' Ruth Fenisong ''The Schemers'' / ''But Not Forgotten'' (1965)
*G-509 ''MY'' Elisabeth Sanxay ''Holding The Virgin Huntress'' / ''The Innocent Mrs. Duff'' (1951)
*G-511 ''MY'' Charlotte Armstrong Lewi (as Charlotte Armstrong) ''The Chocolate Cobweb'' / ''Who's Been Sitting In My Chair?'' (1965)
*G-512 ''MY'' Elisabeth S. Holding ''The Blank Wall'' / ''The Girl Who Had To Die'' (1965)
*G-513 ''MY'' Charlotte Armstrong Lewi (as Charlotte Armstrong) ''Then Came Two Women'' / ''Catch As Catch Can'' (1965)
*G-518 ''MY'' Helen Reilly ''Follow Me'' / ''The Opening Door'' (1965)
*G-519 ''MY'' Elisabeth Sanxay ''Holding The Old Battle Axe'' / ''The Obstinate Murderer'' (1965)
*G-521 ''MY'' Charlotte Armstrong Lewi (as Charlotte Armstrong) ''Mischief'' / ''The Better To Eat You'' (1965)
*G-523 ''MY'' Ursula Curtiss ''The Forbidden Garden'' / ''Hours To Kill'' (1965)
*G-524 ''MY'' Elisabeth Sanxay ''Holding Who's Afraid? '' / ''Widow's Mite'' (1965)
*G-525 ''MY'' Dana Lyon ''The Tentacles'' / ''Spin The Web Tight'' (1965)
*G-526 ''MY'' Charlotte Armstrong Lewi (as Charlotte Armstrong) ''The Mark Of The Hand'' / ''The Dream Walker'' (1965)
*G-528 ''MY'' Helen Reilly ''Certain Sleep'' / ''Ding Dong Bell'' (1965)
*G-529 ''MY'' Dorothy Miles Disney ''Unappointed Rounds'' / ''Mrs. Meeker's Money'' (1965)
*G-530 ''MY'' Elisabeth Sanxay ''Holding The Unfinished Crime'' / ''Net Of Cobwebs'' (1963)
*G-531 ''MY'' Helen Reilly ''Not Me, Inspector'' / ''The Canvas Dagger'' (1965)
*G-533 ''MY'' Charlotte Armstrong Lewi (as Charlotte Armstrong) ''The Black-Eyed Stranger'' / ''The One-Faced Girl'' (1965)
*G-534 ''MY'' Elisabeth Sanxay ''Holding Kill Joy'' / ''Speak Of The Devil'' (1965)
*G-535 ''MY'' Dana Lyon ''The Lost One'' / ''The Frightened Child'' (1965)
*G-539 ''MY'' Hilda Lawrence ''Duet In Death: Composition For Four Hands'' / ''Duet In Death: The House'' (1965)
*G-543 ''MY'' Mildred B. Davis, Mildred Davis ''The Dark Place'' / ''They Buried A Man'' (1965)
*G-573 ''WE'' Tom West ''Rattlesnake Range'' / Merle Constiner ''Top Gun From The Dakotas'' (1966)
*G-574 ''SF'' Avram Davidson ''The Kar-Chee Reign'' / Ursula K. Le Guin ''Rocannon's World'' (1966)
*G-576 ''SF'' John Rackham (author), John Rackham ''Danger From Vega'' / Avram Davidson ''Clash of Star-Kings'' (1966)
*G-577 ''WE'' Roger Spellman ''Big Man From The Brazos'' / Ray Hogan (author), Ray Hogan ''Killer's Gun'' (1966)
*G-579 ''WE'' Lee E. Wells ''Ride A Dim Trail'' / Louis Trimble ''Showdown In The Cayuse'' (1966)
*G-580 ''SF'' Mack Reynolds ''Dawnman Planet'' / Claude Nunes ''Inherit the Earth'' (1966)
*G-584 ''WE'' William E. Vance ''Son Of A Desparado'' / Dwight Bennett Newton (as Clement Hardin) ''The Ruthless Breed'' (1966)
*G-585 ''SF'' John W. Campbell ''The Planeteers'' / ''The Ultimate Weapon'' (1966)
*G-587 ''WE'' Lee Hoffman ''Gunfight At Laramie'' / Brian Garfield (as Frank Wynne) ''The Wolf Pack''
*G-588 ''SF'' Lin Carter ''The Star Magicians'' / John Baxter (author), John Baxter ''The Off-Worlders'' (1966)
*G-591 ''WE'' Dan J. Stevens ''Stage To Durango'' / Tom West ''Hangrope Heritage'' (1966)
*G-592 ''SF'' John Rackham (author), John Rackham ''The Beasts of Kohl'' / John Brunner (novelist), John Brunner ''A Planet Of Your Own'' (1966)
*G-596 ''WE'' Reese Sullivan ''The Demanding Land'' / John Callahan ''Hackett's Feud'' (1966)
*G-597 ''SF'' Ursula K. Le Guin ''Planet of Exile'' / Thomas M. Disch ''Mankind Under the Leash'' (1966)
*G-601 ''WE'' John L. Shelley ''The Return Of Bullet Benton'' / Ray Hogan (author), Ray Hogan ''The Hellsfire Lawman'' (1966)
*G-602 ''SF'' Howard L. Cory ''The Mind Monsters'' / Philip K. Dick ''The Unteleported Man'' (1966)
*G-606 ''SF'' John Rackham (author), John Rackham ''Time to Live'' / Lin Carter ''The Man Without a Planet'' (1966)
*G-607 ''WE'' Merle Constiner ''Rain Of Fire'' / Tom West ''Bitter Brand'' (1966)
*G-609 ''SF'' Philip E. High ''Reality Forbidden'' / A. Bertram Chandler ''Contraband From Otherspace'' (1967)
*G-610 ''WE'' John L. Shelley ''The Siege At Gunhammer'' / Frank Wynee ''The Lusty Breed'' (1967)
*G-614 ''SF'' Walt Richmond (author), Walt Richmond & Leigh Richmond ''Shock Wave'' / Frederick L. Shaw, Jr. ''Envoy to the Dog Star'' (1967)
*G-615 ''WE'' Ray Hogan (author), Ray Hogan ''Legacy Of The Slash M'' / William E. Vance, William Vance ''Tracker'' (1967)
*G-618 ''SF'' Emil Petaja ''The Stolen Sun'' / H. Warner Munn ''The Ship From Atlantis'' (1967)
*G-619 ''WE'' Peter B. Germano, Barry Cord ''Gallows Ghost'' / Stephen Payne ''Room To Swing A Loop''
*G-622 ''WE'' Tom West ''Showdown At Serano'' / Dwight Bennett Newton (as Clement Hardin) ''The Paxman Feud'' (1967)
*G-623 ''SF'' Philip E. High ''These Savage Futurians'' / John Rackham (author), John Rackham ''The Double Invaders'' (1967)
*G-632 ''SF'' A. Bertram Chandler ''Nebula Alert'' / Mack Reynolds ''The Rival Rigelians'' (1967)
*G-633 ''WE'' Wayne C. Lee ''Return To Gunpoint'' / Dan J. Stevens ''The Killers From Owl Creek''
*G-638 ''WE'' Edwin Booth (author), Edwin Booth ''A Time To Shoot'' / Merle Constiner ''The Action At Redstone Creek''
*G-642 ''WE'' Louis Trimble ''Standoff At Massacre Buttes'' / Kyle Hollingshead ''Echo Of A Texas Rifle'' (1967)
*G-648 ''WE'' William E. Vance, William Vance ''The Raid At Crazyhorse'' / Tom West ''Crossfire At Barbed M'' (1967)
*G-659 ''WE'' Dwight Bennett Newton (as Clement Hardin) ''The Oxbow Deed'' / John Callahan ''Kincaid'' (1967)
*G-668 ''WE'' Brian Garfield (as Brian Wynne) ''A Badge For A Badman'' / Ray Hogan (author), Ray Hogan ''Devil's Butte'' (1967)
*G-674 ''WE'' William E. Vance, William Vance ''No Man's Brand'' / Merle Constiner ''Two Pistols South Of Deadwood'' (1967)
*G-682 ''WE'' John Callahan ''Ride For Vengeance'' / Tom West ''Bandit Brand''
*G-687 ''WE'' Dan J. Stevens ''Stranger In Rampart'' / Eric Allen (author), Eric Allen ''The Hanging At Whiskey Smith''
*G-698 ''WE'' Ray Hogan (author), Ray Hogan ''Trouble At Tenkiller'' / Kyle Hollingshead ''The Franklin Raid'' (1968)
*G-705 ''WE'' Peter B. Germano, Barry Cord ''The Long Wire'' / Merle Constiner ''Killers' Corral'' (1968)
*G-710 ''WE'' Tom West ''The Face Behind The Mask'' / Louis Trimble ''Marshall Of Sangaree'' (1968)
*G-721 ''WE'' Don P. Jenison ''The Silver Concho'' / Lee Hoffman ''Dead Man's Gold'' (1968)
*G-723 ''SF'' Andre Norton ''Star Hunter'' / ''Voodoo Planet'' (1968)
*G-727 ''WE'' John Callahan ''Tracks Of The Hunter'' / Clay Ringold ''Return To Rio Fuego'' (1968)
*G-732 ''WE'' Reese Sullivan ''The Trouble Borrower'' / Dwight Bennett Newton (as Clement Hardin) ''Ambush Reckoning'' (1968)
*G-742 ''WE'' Tom West ''Write His Name In Gunsmoke'' / Dean Owens ''Lone Star Roundup'' (1968)
*G-747 ''WE'' Ray Hogan (author), Ray Hogan ''Killer On The Warbucket'' / Dean Owen ''Sage Tower'' (1968)
*G-755 ''WE'' Wayne C. Lee ''Trail Of The Skulls'' / Merle Constiner ''The Four From Gila Bend'' (1968)
*G-760 ''WE'' Reese Sullivan ''The Vengeance Ghost'' / X.X. Jones ''Bronc'' (1968)
*G-764 ''WE'' Louis Trimble ''West To The Pecos'' / John Callahan Jernigan ''Jernigan'' (1968)

H Series

*H-20 ''SF'' Kenneth Bulmer ''The Key to Irunium'' / Alan Schwartz (author), Alan Schwartz ''The Wandering Tellurian'' (1967)
*H-21 ''SF'' Jack Vance ''The Last Castle'' / Tony Russell Wayman ''World Of The Sleeper'' (1967)
*H-22 ''SF'' Tom Purdom ''Five Against Arlane'' / Emil Petaja ''Lord of the Green Planet'' (1967)
*H-27 ''SF'' Juanita Coulson ''Crisis on Cheiron'' / Edwin Charles Tubb, E. C. Tubb ''The Winds of Gath'' (1967)
*H-29 ''SF'' Walt Richmond (author), Walt Richmond and Leigh Richmond ''The Lost Millennium'' / A. Bertram Chandler ''The Road to the Rim'' (1967)
*H-34 ''SF'' Mack Reynolds ''Computer War'' / Edwin Charles Tubb, E. C. Tubb ''Death is a Dream'' (1967)
*H-36 ''SF'' Emil Petaja ''Tramontane'' / Michael Moorcock ''The Wrecks Of Time'' (1967)
*H-40 ''SF'' Edwin Charles Tubb, E. C. Tubb ''C.O.D. Mars'' / John Rackham (author), John Rackham ''Alien Sea'' (1968)
*H-48 ''SF'' Ellen Wobig ''The Youth Monopoly '' / Lan Wright ''The Pictures Of Pavanne'' (1968)
*H-51 ''SF'' John M. Faucette ''Crown Of Infinity'' / Emil Petaja ''The Prism'' (1968)
*H-56 ''SF'' Ernest Hill (author), Ernest Hill ''Pity About Earth'' / R. A. Lafferty ''Space Chantey'' (1968)
*H-59 ''SF'' Philip E. High ''The Time Mercenaries'' / Louis Trimble ''Anthropol'' (1968)
*H-65 ''SF'' Mack Reynolds ''Mercenary From Tomorrow'' / Kenneth Bulmer ''The Key to Venudine'' (1968)
*H-70 ''SF'' Dean Koontz, Dean R. Koontz ''Star Quest'' / Emil Petaja ''Doom of the Green Planet'' (1968)
*H-77 ''SF'' Juanita Coulson ''The Singing Stones'' / Edwin Charles Tubb, E. C. Tubb ''Derai'' (1968)
*H-85 ''SF'' Philip E. High ''Invader on My Back'' / Donald A. Wollheim (as David Grinnell) and Lin Carter ''Destination: Saturn'' (1968)
*H-91 ''SF'' Laurence Janifer, Laurence M. Janifer and S.J. Treibich ''Target Terra'' / John Rackham (author), John Rackham ''The Proxima Project'' (1968)
*H-95 ''SF'' Clifford D. Simak ''So Bright the Vision'' / Jeff Sutton ''The Man Who Saw Tomorrow'' (1968)
*H-103 ''SF'' Mack Reynolds ''Code Duello'' / John M. Faucette ''The Age of Ruin'' (1968)

Numbered series

*01685 ''SF'' Gordon R. Dickson ''Alien Art'' / ''Arcturus Landing''
*04612 ''WE'' Tom West ''Bad Blood At Bonita Basin'' / Tom West ''Rattlesnake Range'' (1972)
*05595 ''SF'' Kenneth Bulmer, Ken Bulmer ''Electric Sword Swallowers'' / John Rackham (author), John Rackham ''Beyond Capella'' (February 1971)
*06612 ''SF'' Mack Reynolds ''Blackman's Burden'' / ''Border, Breed Nor Birth'' (August 1972)
*06707 ''SF'' Brian Stableford, Brian M. Stableford ''The Blind Worm'' / Emil Petaja ''Seed of the Dreamers'' (February 1970)
*06760 ''WE'' C. Hall Thompson ''The Killing Of Hallie James'' / Ray Hogan (author), Ray Hogan ''The Bloodrock Valley War'' (1969)
*08560 ''WE'' Louis Trimble ''Siege At High Meadow'' / Tom West ''The Buzzard's Nest'' (1973)
*09135 ''WE'' Clay Ringold ''The Hooded Gun'' / Sam Bowie (author), Sam Bowie ''Canyon War'' (1969)
*00990 ''SF'' Susan K. Putney ''Against Arcturus'' / Dean Koontz, Dean R. Koontz ''Time Thieves'' (May 1972)
*10293 ''SF'' John Rackham (author), John Rackham ''Earthstrings'' / Kenneth Bulmer, Ken Bulmer ''The Chariots of Ra'' (July 1972)
*10665 ''WE'' Giles A. Lutz ''The Challenger'' / Tom West ''The Phantom Pistoleer'' (1960)
*11182 ''SF'' Ron Goulart ''Clockwork Pirates'' / ''Ghost Breaker'' (March 1971)
*11451 ''SF'' A. Bertram Chandler ''Coils of Time'' / ''Into The Alternate Universe'' (November 1972)
*11530 ''WE'' Louis Trimble ''The Lonesome Mountains'' / Dwight Bennett Newton (as Clement Hardin) ''Colt Wages'' (1970)
*11555 ''SF'' A. Bertram Chandler ''The Commodore at Sea'' / ''Spartan Planet''
*11556 ''SF'' A. Bertram Chandler ''The Commodore at Sea'' / ''Spartan Planet'' (same cover as 11555–1)
*11560 ''SF'' Suzette Haden Elgin ''The Communipaths'' / Louis Trimble ''The Noblest Experiment'' (October 1970)
*11650 ''SF'' Mack Reynolds ''Computer War'' / ''Code Duello'' (February 1973)
*11705 ''SF'' Robert Silverberg ''Conquerors From the Darkness'' / ''Master of Life and Death''
*11738 ''WE'' Dan J. Stevens ''Hunter's Moon'' / Tom West ''Corral This Killer'' (1973)
*11785 ''WE'' Phillip Ketchum ''The Cougar Basin War'' / Louis Trimble ''Trouble Valley''
*12140 ''SF'' Brian Stableford, Brian M. Stableford ''Cradle of the Sun'' / Kenneth Bulmer, Ken Bulmer ''The Wizards of Senchuria'' (August 1969)
*13783 ''SF'' A. Bertram Chandler ''The Dark Dimensions'' / ''Alternate Orbits'' (May 1971)
*13793 ''SF'' Dean Koontz, Dean R. Koontz ''Soft Come the Dragons'' / ''Dark of the Woods'' (November 1970)
*13805 ''SF'' John Rackham (author), John Rackham ''Dark Planet'' / Nick Kamin ''The Herod Men'' (June 1971)
*14193 ''WE'' Nelson Nye ''Death Valley Slim'' /''The Kid From Lincoln County''
*14195 ''WE'' Kyle Hollingshead ''Ransome's Debt'' / Merle Constiner ''Death Waits At Dakins Station'' (1970)
*14250 ''SF'' Mack Reynolds ''Depression Or Bust'' / ''Dawnman Planet'' (October 1973)
*14265 ''WE'' Norman A. Daniels, Norman Daniels ''The Plunderers'' / Tom West ''Desperado Doublecross'' (1970)
*15697 ''SF'' Philip K. Dick ''The Unteleported Man'' / ''Dr. Futurity'' (September 1972)
*15890 ''SF'' A. Bertram Chandler ''The Rim of Space'' / Marion Zimmer Bradley ''The Door Through Space'' (February 1972)
*16640 ''SF'' Jack Vance ''The Dragon Masters'' / ''The Five Gold Bands'' (April 1972)
*16641 ''SF'' Jack Vance ''The Dragon Masters'' / ''The Last Castle'' (April 1973)
*17000 ''WE'' Reese Sullivan ''The Deadly Deputy'' / Dan J. Stevens ''The Dry Fork Incident'' (1969)
*17235 ''WE'' Don P. Jenison ''South To New Range'' / Clay Ringold ''Duel In Lagrima Valley'' (1970)
*20571 ''SF'' Samuel R. Delany ''The Ballad of Beta-2'' / ''Empire Star'' (November 1973)
*22576 ''SF'' Marion Zimmer Bradley ''Falcons of Narabedla'' / ''The Dark Intruder & Other Stories'' (December 1972)
*22600 ''SF'' Dean Koontz, Dean R. Koontz ''The Fall Of The Dream Machine'' / Kenneth Bulmer ''The Star Venturers'' (January 1969)
*23140 ''SF'' Dean Koontz, Dean R. Koontz ''Fear That Man'' / Edwin Charles Tubb, E. C. Tubb ''Toyman'' (May 1969)
*23775 ''SF'' Barry N. Malzberg (as K.M. O'Donnell) ''Final War and Other Fantasies'' / John Rackham (author), John Rackham ''Treasure of Tau Ceti'' October 1969)
*24035 ''SF'' Mack Reynolds ''The Five Way Secret Agent'' / ''Mercenary from Tomorrow'' (December 1973)
*24100 ''SF'' John Rackham (author), John Rackham ''Flower of Doradil'' / Jeremy Strike ''A Promising Planet'' (May 1970)
*24890 ''SF'' H. Beam Piper ''Four-Day Planet'' / ''Lone Star Planet''
*24892 ''SF'' H. Beam Piper ''Four-Day Planet'' / H. Beam Piper and John J. McGuire ''Lone Star Planet''
*24925 ''WE'' Merle Constiner ''The Fourth Gunman'' / Tom West ''Slick On The Draw''
*27235 ''SF'' Walt Richmond (author), Walt Richmond and Leigh Richmond ''Gallagher's Glacier'' / ''Positive Charge'' (April 1970)
*27251 ''WE'' Peter B. Germano, Barry Cord ''Gallows Ghost'' / ''The Long Wire'' (1967)
*27376 ''WE'' Tom West ''Gallows Gulch'' / ''The Man At Rope's End'' (1964)
*27400 ''SF'' Neal Barrett, Jr. ''The Gates of Time'' / Barry N. Malzberg (as K.M. O'Donnell) ''Dwellers of the Deep'' (December 1970)
*27415 ''SF'' Barry N. Malzberg (as K.M. O'Donnell) ''Gather in the Hall of Planets'' / ''In the Pocket and Other S-F Stories'' (September 1971)
*30300 ''SF'' Fritz Leiber ''The Green Millennium'' / ''Night Monsters'' (March 1969)
*30701 ''WE'' Nelson Nye ''Rogue's Rendezvous'' / ''Gun Feud At Tiedown'' (1965)
*30850 ''WE'' Tom West ''Black Buzzards Of Bueno'' / Ben Smith (author), Ben Smith ''The Guns Of Sonora'' (1969)
*31739 ''WE'' Edwin Booth (author), Edwin Booth ''Hardesty'' / Reese Sullivan ''The Stranger'' (1972)
*31755 ''SF'' A. Bertram Chandler ''The Hard Way Up'' / Robert Lory ''The Veiled World'' (October 1972)
*32718 ''WE'' Peter B. Germano, Barry Cord ''Hell In Paradise Valley'' / Clay Ringold ''The Night Hell's Corners Died''
*33460 ''WE'' Louis Trimble ''Wild Horse Range'' / William O. Turner ''The High Hander'' (1963)
*33710 ''SF'' Neal Barrett Jr. ''Highwood'' / Barrington J. Bayley, Barrington Bayley ''Annihilation Factor'' (January 1972)
*37062 ''SF'' A. Bertram Chandler ''The Inheritors'' / ''The Gateway to Never'' (June 1972)
*37063 ''SF'' A. Bertram Chandler ''The Inheritors'' / ''The Gateway to Never''
*37064 ''SF'' A. Bertram Chandler ''The Inheritors'' / ''The Gateway to Never''
*37108 ''SF'' A. Bertram Chandler ''Into the Alternate Universe'' / ''Contraband From Otherspace''
*37109 ''SF'' A. Bertram Chandler ''Into the Alternate Universe'' / ''Contraband From Otherspace''
*37130 ''SF'' Robert Silverberg ''Invaders From Earth'' / ''To Worlds Beyond''
*37250 ''SF'' Marion Zimmer Bradley ''The Brass Dragon'' / John Rackham (author), John Rackham ''Ipomoea'' (April 1969)
*37365 ''SF'' Robert E. Howard ''The Iron Man'' / ''The Adventures of Dennis Dorgan''
*38500 ''WE'' Kyle Hollingshead ''Ransome's Move'' / L. L. Foreman ''Jemez Brand'' (1971)
*42800 ''SF'' Edwin Charles Tubb, E. C. Tubb ''Kalin''/ Alex Dain ''The Bane of Kanthos'' (September 1969)
*42900 ''SF'' Lin Carter ''Tower Of The Medusa'' / George H. Smith (fiction author), George H. Smith ''Kar Kaballa'' (November 1969)
*47200 ''WE'' L. L. Foreman ''Last Stand Mesa'' / Phillip Ketchum ''Mad Morgan's Hoard'' (1969)
*48245 ''SF'' John T. Phillifent ''Life With Lancelot'' / William Barton (writer), William Barton ''Hunting on Kunderer'' (August 1973)
*48755 ''WE'' Tom West ''Lobo Of Lynx Valley'' / Louis Trimble ''The Ragbag Army'' (1971)
*48885 ''WE'' Brian Garfield (as Brian Wynne) ''Gunslick Territory'' / John Callahan ''Loner With A Gun'' (1973)
*49252 ''SF'' Philip José Farmer ''Lord of the Trees'' / ''The Mad Goblin'' (May 1970)
*49301 ''WE'' Lin Searles ''Saddle In The Wind'' / Tom West ''Lost Loot Of Kittycat Ranch'' (1965)
*51375 ''SF'' Philip José Farmer ''The Mad Goblin'' / Philip José Farmer ''Lord of the Trees'' (September 1970)
*52035 ''WE'' Eric Allen Marshall ''From Whiskey Smith'' / Gene Tuttle ''Imposters In Mesquite''
*52180 ''SF'' Robert Lory ''A Harvest Of Hoodwinks'' / ''Masters Of The Lamp'' (July 1970)
*53415 ''SF'' John T. Phillifent ''Hierarchies'' / Doris Piserchia ''Mister Justice'' (May 1973)
*53540 ''WE'' William E. Vance ''The Wolf Slayer'' / Brian Garfield (as Brian Wynne) ''Mr. Sixgun'' (1954)
*57140 ''WE'' Ray Hogan (author), Ray Hogan ''New Gun For Kingdom City'' / ''The Shotgunner''
*57601 ''WE'' Reese Sullivan ''Nemesis Of Circle A'' / Brian Garfield (as Brian Wynne) ''The Night It Rained Bullets'' (1965)
*58601 ''WE'' Merle Constiner ''Two Pistols South Of Deadwood'' / William E. Vance, William Vance ''No Man's Brand''
*58880 ''SF'' Sam Lundwall ''Alice's World'' / ''No Time For Heroes'' (January 1971)
*60990 ''WE'' Reese Sullivan ''Man On The Run'' / John Callahan ''Odds Against The Texan'' (1971)
*65874 ''SF'' Robert Sheckley ''The People Trap'' / ''Mindswap''
*66093 ''SF'' Walter Ernsting, Clark Darlton ''The Stolen Spacefleet'' / Kurt Mahr ''Sgt. Robot''
*66094 ''SF'' William Voltz ''Seeds of Ruin'' / K. H. Scheer ''Planet Mechanica''
*66095 ''SF'' Walter Ernsting, Clark Darlton ''Heritage of the Lizard People'' / Kurt Mahr ''Death's Demand''
*66096 ''SF'' Kurt Brand ''Saboteurs in A-1'' / William Voltz ''The Psycho Duel''
*66097 ''SF'' K. H. Scheer ''Savior of the Empire'' / Walter Ernsting, Clark Darlton ''The Shadows Attack''
*66098 ''SF'' W. W. Shols ''The Wasp Men Attack'' / Ernest Vlcek ''Atlan #1: Spider Desert''
*66099 ''SF'' Kurt Mahr ''Menace of Atomigeddon'' / Walter Ernsting, Clark Darlton ''Atlan #2: Flight from Tarkihl''
*66121 ''SF'' W. W. Shols ''Robot Threat: New York'' / Hans Kneifel ''Atlan #3: Pale Country Pursuit''
*66128 ''SF'' K. H. Scheer ''Atlan #4: The Crystal Prince'' / Walter Ernsting, Clark Darlton ''Atlan #5: War of the Ghosts''
*66160 ''SF'' Nick Kamin ''Earthrim'' / Walt Richmond (author), Walt Richmond and Leigh Richmond ''Phoenix Ship'' (December 1969)
*66525 ''SF'' Murray Leinster ''The Mutant Weapon'' / ''Pirates of Zan'' (October 1971)
*66995 ''SF'' Mack Reynolds ''The Rival Rigelians'' / ''Planetary Agent X'' (September 1973)
*67021 ''SF'' Marion Zimmer Bradley''The Planet Savers'' / ''The Sword of Aldones''
*67025 ''SF'' Marion Zimmer Bradley''The Planet Savers'' / ''The Sword of Aldones''
*67026 ''SF'' Marion Zimmer Bradley''The Planet Savers'' / ''The Sword of Aldones''
*67027 ''SF'' Marion Zimmer Bradley''The Planet Savers'' / ''The Sword of Aldones''
*67580 ''WE'' Ray Hogan (author), Ray Hogan ''The Vengeance Gun'' / L. L. Foreman ''Powdersmoke Partners'' (1973)
*68310 ''SF'' John Glasby ''Project Jove'' / Kenneth Bulmer, Ken Bulmer ''The Hunters of Jundagai'' (August 1971)
*70350 ''WE'' Nelson Nye ''Hideout Mountain'' / ''Rafe'' (1962)
*71082 ''SF'' Claudia Nunes and Rhoda Nunes ''Recoil'' / Edwin Charles Tubb, E. C. Tubb ''Lallia'' (April 1971)
*71372 ''WE'' Louis Trimble ''The Hostile Peaks'' / Tom West ''Renegade Roundup'' (1969)
*72260 ''WE'' Gordon D. Shirreffs ''Quicktrigger'' / ''Rio Desperado''
*72360 ''WE'' John Callahan ''Ride The Wild Land'' / ''Jernigan'' (1965)
*72400 ''SF'' A. Bertram Chandler ''The Rim Gods'' / Laurence Janifer, Laurence M. Janifer ''The High Hex'' (February 1969)
*72401 ''SF'' A. Bertram Chandler ''The Dark Dimension'' / ''The Rim Gods''
*72402 ''SF'' A. Bertram Chandler ''The Rim of Space'' / ''The Ship From Outside''
*72403 ''SF'' A. Bertram Chandler ''The Dark Dimension'' / ''The Rim Gods'' (August 1978)
*72525 ''WE'' Brian Garfield (as Frank Wynne) ''Call Me Hazard'' / Dean Owen ''The Rincon Trap'' (1966)
*73100 ''SF'' A. Bertram Chandler ''The Road to the Rim'' / ''The Hard Way Up''
*73101 ''SF'' A. Bertram Chandler ''The Road to the Rim'' / ''The Hard Way Up''
*73102 ''SF'' A. Bertram Chandler ''The Road to the Rim'' / ''The Hard Way Up''
*73390 ''SF'' Avram Davidson ''The Kar-Chee Reign'' / ''Rogue Dragon''
*74180 ''WE'' Peter B. Germano, Barry Cord ''Desert Knights'' / ''The Running Iron Samaritans'' (1973)
*75150 ''WE'' Ray Hogan (author), Ray Hogan ''Track The Man Down'' / Lee. E. Wells ''Savage Range'' (1965)
*75520 ''WE'' Tom West ''Scorpion Showdown'' / Clay Ringold ''Reckoning In Fire Valley'' (1969)
*75781 ''SF'' Leigh Brackett ''The Secret of Sinharat'' / Leigh Brackett ''People of the Talisman'' (November 1971)
*75968 ''WE'' Nelson Nye ''Bancroft's Banco'' / ''The Seven Six-Gunners'' (1963)
*76096 ''SF'' Jeff Sutton ''Altons Unguessable'' / Kenneth Bulmer, Ken Bulmer ''The Ships of Durostorum'' (June 1970)
*76380 ''SF'' William F. Temple ''Battle on Venus'' / William F. Temple ''The Three Suns of Amara'' (June 1973)
*76900 ''WE'' Dean Owens ''The Skull Riders'' / Merle Constiner ''The Man Who Shot "The Kid"'' (1969)
*76960 ''SF'' Lester del Rey ''Badge of Infamy'' / ''The Sky is Falling'' (January 1973)
*77525 ''SF'' Jack Vance ''Son of the Tree'' / ''The Houses of Iszm'' (December 1971)
*77710 ''SF'' Robert Lory ''The Eyes Of Bolsk'' / Mack Reynolds ''The Space Barbarians'' (June 1969)
*77785 ''SF'' Eric Frank Russell ''Six Worlds Yonder'' 6 unrelated stories. / ''The Space Willies'' A spoof on Scientology. (July 1971)
*77910 ''WE'' Dwight Bennett Newton (as Clement Hardin) ''Stage Line To Rincon'' / Ray Hogan (author), Ray Hogan ''A Man Called Ryker'' (1971)
*77925 ''WE'' Stephen Payne ''Stampede On Farway Pass'' / Brian Garfield (as Frank Wynne) ''Lynch Law Canyon'' (1965)
*78400 ''SF'' John Jakes ''Mask of Chaos'' / Barrington J. Bayley, Barrington Bayley ''The Star Virus'' (August 1970)
*78537 ''SF'' Robert Sheckley ''The Status Civilization'' / ''Notions: Unlimited''
*79117 ''WE'' Tom West ''Sweetgrass Valley Showdown'' / Dean Owen ''Gun Country'' (1971)
*79601 ''WE'' Roger Spellman ''Tall For A Texan'' / ''Big Man From The Brazos'' (1965)
*79975 ''SF'' Edwin Charles Tubb, E. C. Tubb ''Technos'' / Edwin Charles Tubb, E. C. Tubb ''A Scatter of Stardust'' (March 1972)
*81237 ''SF'' Gordon R. Dickson ''Time to Teleport'' / ''Delusion World''
*81610 ''SF'' Donald A. Wollheim (as David Grinnell) ''To Venus! To Venus!'' / Edwin Charles Tubb, E. C. Tubb ''The Jester at Scar'' (March 1970)
*81680 ''SF'' John Jakes ''Tonight We Steal The Stars'' / Laurence Janifer, Laurence M. Janifer and S. J. Treibich ''The Wagered World'' (July 1969)
*81861 ''WE'' Merle Constiner ''Guns At Q Cross'' / Tom West ''The Toughest Town In The Territory''
*82101 ''WE'' Brian Garfield ''Trail Drive'' / Louis Trimble ''Trouble At Gunsight'' (1964)
*82190 ''WE'' Harry Whittington ''A Trap For Sam Dodge'' / ''Valley Of Savage Men'' (1965)
*82435 ''WE'' Peter B. Germano, Barry Cord ''The Coffin Fillers'' / Don T. Jenison ''Trouble On Diamond Seven'' (1972)
*83360 ''WE'' Peter B. Germano, Barry Cord ''Two Graves For A Lawman'' / ''The Deadly Amigos''
*86465 ''WE'' Don P. Jenison ''Zero Hour At Black Butte'' / Dwight Bennett Newton (as Clement Hardin) ''Sherriff Of Sentinel'' (1969)
*86495 ''SF'' L. Sprague de Camp ''The Virgin of Zesh'' / ''The Tower of Zanid''
*89250 ''SF'' Marion Zimmer Bradley ''The Winds Of Darkover'' / John Rackham (author), John Rackham ''The Anything Tree'' (January 1970)
*89301 ''SF'' Edwin Charles Tubb, E. C. Tubb ''Derai'' / ''The Winds of Gath'' (July 1973)
*89590 ''WE'' L. P. Holmes ''Smoky Pass'' / L. P. Holmes ''Wolf Brand'' (1962)
*93900 ''SF'' Ross Rocklynne ''The Sun Destroyers'' / Edmond Hamilton ''A Yank at Valhalla'' (March 1973)

See also

*Tor Double Novels – a later series of science fiction doubles published by Tor Books between 1988 and 1991

References

Ace Image Library
Contains images of most covers for the doubles in all genres, as well as many of the single titles.
Bookscans
Contains numerous images of the Ace covers.
*Corrick, James A. ''Double Your Pleasure: The Ace SF Double'', Gryphon Books, 1989. . A historical article, followed by a checklist of the SF Doubles, giving prior publication history for the contents of each one.
*J. Grant Thiessen, Thiessen, J. Grant ''Science Fiction Collector #1'', Pandora's Books, 1976. Includes Ace Double checklist.
*J. Grant Thiessen, Thiessen, J. Grant ''Science Fiction Collector #2'', Pandora's Books, date unknown. Includes errata for checklist in #1.
*Donald H. Tuck, Tuck, Donald H. ''The Encyclopedia of Science Fiction and Fantasy: Volume 3'', Advent: Publishers, Inc., 1982. . Lists all ACE sf titles, single and double, published through 1968.

The following references have not been reviewed:

*Sheldon Jaffery, Jaffery, Sheldon ''Double Trouble: A Bibliographic Chronicle of Ace Mystery Doubles'', Starmont Popular Culture Series no. 11, Borgo Press, 1987. .
*Sheldon Jaffery, Jaffery, Sheldon ''Double Futures: An Annotated Bibliography of the Ace Science Fiction Doubles'', Borgo Press, 1999. {{ISBN, 1-55742-139-0.
*Peters, Harold R. ''Science Fiction, Fantasy & Horror in the Ace Letter-Series Editions: A Collector's Notebook'', Silver Sun Press, 1996.

Lists of Ace Books books, Double Novels
Tête-bêche books, Ace Double Novels