Includes "Murder Nightmare" by Norman A. Daniels.
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Features "Alibi Trail" by Maxwell Grant.
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Cover by Alex Schomburg. Includes "The White Widows" by Sam Merwin, Jr.
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Includes "The Room" by L. Ron Hubbard.
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Cover by Rogers. Includes "Magic City" by Nelson S. Bond.
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Includes "Webbed Hands" by Ferdinand Berthoud.
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Only issue. Cover by Joseph Chenoweth. Includes "Gods Guard The Brave" by H. Bedford Jones.
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Includes "The Gods Hate Kansas" by Joseph J. Millard.
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Includes " Voice Of Death" by Maxwell Grant.
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Cover by Lee Brown Coye. Includes "Four From Jehlam" by Allison Harding.
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Includes "The Three Planeteers" by Edmond Hamilton.
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Includes "Dream-Dust From Mars" by Manly Wade Wellman
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Cover design by E.M. Stevenson. Includes "He" by H.P. Lovecraft.
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Cover by A. R. Tilburne. Includes "The Eager Dragon" by Robert Bloch.
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"The Condor Rides With Death" by Robert J. Hogan.
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Includes "Heredity" by Isaac Asimov.
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Includes "The Lonely Planet" by Murray Leinster.
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Cover by Earle K. Bergey. Includes "Sojarr Of Titan" by Manly Wade Wellman.
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Includes "The Prisoner Of Mars" by Edmond Hamilton.
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Includes "The Army Without A Country" by Curtis Steele.
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Cover by Virgil Finlay. Includes "From Beyond" by H. P. Lovecraft.
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Includes "Seal Of Treason" by Murray R. Montgomery.
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Cover by Joseph Eberle. Includes "A Corner For Lucia" by August Derleth.
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Cover by Hannes Bok. Includes "Beauty's Beast" by Robert Bloch.
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Features "Dictator of Crime" by Maxwell Grant.
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Continuing from WAR BIRDS. Cover by Rudolph Belarski. Includes "O'Leary's Fights The Golden Ray" by Arthur Guy Empy.
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Cover by Virgil Finlay. Includes "Spotted Satan" by Otis A. Kline.
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Cover by Rogers. Includes "The Professor Was A Thief" by L. Ron Hubbard.
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Cover by H. W. Brown. Includes "The Tramp" Part 2 by L. Ron. Hubbard.
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Includes "9 G's And Pull Out" by Lee Gehlbach.
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Cover by Rogers. Includes "Crisis In Utopia" by Norman L. Knight.
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Includes "The Impossible World" by Eando Binder
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Cover design by C. C. Serf. Includes "Sea Curse" by Robert E. Howard.
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Cover by F. Tinsley. Includes "Hawks Of The North" by George L. Eaton.
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Includes "The Voice Of The Lobster" by Henry Kuttner.
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Cover by John Howitt. Includes "Emperor Of The Yelloe Death" by Grant Stockbridge.
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Cover by Modest Stein. Features "Overthrow" by Cleve Cartmill.
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Cover by Rogers. Includes "The Stars Look Down" by Lester del Rey.
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Cover by John Howett. Includes "Devil's Sculptor" by Arthur J. Burks.
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Cover by Rudolph Belarski. Includes short novel "Sons Of The Tall Timber" by Frank R. Pierce.
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Includes "Give Me Ten Men" by Charles Marquis Warren.
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Cover by Matt Fox. Includes "Twilight Of The Gods" by Edmond Hamilton.
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Includes "And So To Death" by Cornell Woolrich.
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Includes "The Book Of Ptath" by A. E. van Vogt.
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Cover by H. W. Brown. Includes "Mercutian Adventure" by Raymond Z. Gallun.
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Includes "Outlaws Of The Moon" by Edmond Hamilton.
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Cover by Bill Wayne. Includes "The Shadow From The Steeple" by Robert Bloch.
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Cover by J. Allen St. John. Includes "Buccaneers Of Venus (Part 2)" by Otis Adelbert Kline.
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Cover by Ed Valigursky. Includes "The Snows Of Ganymede" by Poul Anderson.
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Cover by Alex Schomburg. Includes "The Star Watchers" by Eric Frank Russell.
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Cover by Earle Bergey. Includes "The Seed From Space" by Fletcher Pratt.
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Cover by Earle Bergey. Includes "Tough Old Man" by L. Ron Hubbard.
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Cover by Earle K. Bergey. Includes "Hollywood On The Moon" by Henry Kuttner.
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Cover by Earle K. Bergey. Includes "The Visitor" by Ray Bradbury.
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Cover by Earle K. Bergey. Includes "Strangers On The Heights" by Manly Wade Wellman.
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Cover by Rudolph Belarski. Includes "The Water World" by Oscar J. Friend.
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Final issue of first series.
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Includes "We Fly The Silvaire De Luxe" by William Winter.
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Cover by F. Tinsley. Includes "The Blood-Red Road To Petra" by George L. Eaton.
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Cover by Rogers. Includes "Forces Must Balance!" by Manly Wade Wellman.
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"Fangs of the Serpent" by Robert J. Hogan.
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Includes "Twice In Time" by Manly Wade Wellman.
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Cover by M. Isip. Includes "The Roaring Trumpet" by L. Sprague de Camp & Fletcher Pratt.
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Cover by Earle K. Bergey. Includes "The Dark Angel" by Henry Kuttner.
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Cover by Rogers. Includes "Methuselah's Children" part 1 by Robert Heinlein.
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Cover by Margaret Brundage. Includes "Red Nails" by Robert E. Howard.
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Cover by John Howitt. Includes "Rockets From Hell" by Curtis Steele.
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Cover by Margaret Brundage. Includes "A Wig For Miss Devore" by August Derleth.
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Cover by Rogers. Includes "Breakdown" by Jack Williamson and "The Invaders" by L. Ron Hubbard.
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Cover by Rogers. Includes "Space Can" by L. Ron Hubbard.
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Includes "The Bat Staffel" by Robert J. Hogan.
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"Bombs from the Murder Wolves" by Robert J. Hogan.
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Includes "The Seven Sleepers" by Henry Kuttner & A.. Barnes.
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Cover by William Timmins. Includes "Clash By Night" by Lawrence O'Donnell.
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Includes "The Mind Magnet" by Paul Ernst.
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Cover by John Howitt. Includes "Death's Crimson Juggernaut" by Grant Stockbridge.
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Includes "Death In A Cockpit" by Arthur J. Burks.
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Cover by John Howitt. Includes "The Army Of The Dead" by Curtis Steele.
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Cover by John Howitt. Includes "Invasion of The Yellow Warlords" by Curtis Steele.
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Cover by John Howitt. Includes "March Of The Flame Marauders" by Curtis Steele.
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Cover by John Howitt. Includes "Cavern Of The Damned" by Curtis Steele.
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Features "The Running Skeletons" by Kenneth Robeson.
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Features "The Headless Men" by Kenneth Robeson.
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