Includes "The Yellow Cloud" by Kenneth Robeson.
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Includes "The Money Master" by Maxwell Grant.
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Includes "The Humanoids" by Jack Williamson. Cover by Anderson.
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Cover by Emery Clarke. Includes "The Angry Ghost" by Kenneth Robeson.
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Includes "Traitress' Wages" by Lew Merrill.
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Cover by Earle K. Bergey. Includes "Red Sun Of Danger" by Brett Sterling.
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Cover by Jack Coggins. Includes "The Amateur Alchemist" by Murray Leinster.
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Cover by W. H. Silvey. Includes "The House In The Valley" by August Derleth.
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Cover by F. Tinsley. Includes "The Black Hawk" by George L. Eaton.
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Cover by Pete Kuhlhoff. Includes "The Man Who Cried 'Wolfe'!" by Robert Bloch.
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Includes Williamson, Simak.
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Includes "Frontier Planet" by Manly Wade Wellman.
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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 John Howitt. Includes "The League Of War Monsters" by Curtis Steele.
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Cover by Ed Emsh. Includes "An Apple For The Teacher" by Robert F. Young.
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Features "Pirate Isle" by Kenneth Robeson.
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Features "Masters of Death" by Maxwell Grant.
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Cover by Walter Baumhofer. Includes "The Spider Strikes" by R. T. M. Scott.
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Cover by John Howitt. Includes "Death's Crimson Juggernaut" by Grant Stockbridge.
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Includes "The Northdale Mystery" by Maxwell Grant.
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Features "Men of Fear" by Kenneth Robeson.
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Cover by Belarski. Includes "All Survivors Report" by Georges Surdez.
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Includes "The Gods Hate Kansas" by Joseph J. Millard.
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Cover by William Timmins. Includes "The Weapon Shop" by A. E. van Vogt.
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Includes "The Jumper" by Theodore Sturgeon.
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Cover by Jon Arfstrom. Digest size.
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Cover by John Howitt. Includes "The Pain Emperor" by Grant Stockbridge.
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Cover by George Rozen. Includes "The Sky Hawk Screams" by Arthur Guy Empy.
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Cover by Margaret Brundage. Includes "The Brood Of Bubastis" by Robert Bloch.
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Includes "Assignment In Guana" by George Harmon Coxe.
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Cover by Margaret Brundage. Includes "Shadows In Zamboula" by Robert E. Howard.
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Cover by John Howitt. Includes "War Masters From The Orient" by Curtis Steele.
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Includes "Speak For Yourself" by John Quincy.
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Includes " Voice Of Death" by Maxwell Grant.
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Cover by Herbert Morton Stoops. Includes "Swords Of Mars" by Edgar Rice Burroughs.
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Cover by Rudolph W. Zirm. Includes "By Night They Creep" by Ray Cummings.
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Features "The Magic Forest" by Kenneth Robeson.
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Includes "Typewriters In The Sky Part 1" by L. Ron Hubbard.
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Includes "The Bat Staffel" by Robert J. Hogan.
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Cover by Rogers. Includes "Time Wants A Skeleton" by Ross Rocklynne.
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Includes a 16-page color comics section.
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Includes "Death's Masquerade" by Maxwell Grant.
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Cover by F. Tinsley. Includes "Europe Preens Her Wings" by Clyde Pangborn.
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Includes "Hitler's Secret Terror" by J. Forman & Ro. Carse.
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Includes "Murder Over Hollywood" by George L. Eaton.
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Cover by Earle Bergey. Includes "The Seed From Space" by Fletcher Pratt.
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Cover by Cartier. Includes "Lest Darkness Fall" by L. Sprague de Camp.
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Includes "No Greater Love" by Henry Kuttner.
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Cover by J. Allen St. John. Includes "Buccaneers Of Venus (Part 2)" by Otis Adelbert Kline.
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Includes "Merchants of Disaster" by Kenneth Robeson
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Final issue. "Wings of the Death Tiger" by Robert J. Hogan.
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Features "The Well Ones" by Kenneth Robeson.
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Cover by Margaret Brundage. Includes "Three Gentlemen In Black" by August W. Derleth.
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Includes "Test Pilot Test" by Tracy Richardson.
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Cover by Margaret Brundage. Includes "The Devil In Iron" by Robert E. Howard.
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Cover by H. W. Scott. Includes "None But Lucifer" by H. L. Gold & L. Sprague de Camp.
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Includes "The Day Of The Cloud" by Ross Rocklynne.
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Cover design by C.C. Serf. Includes "The Hyena" by Robert E. Howard.
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Includes "Spank Magic" by Reggie Coghlan.
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Cover by A. R. Tilburne. Includes "The Valley Of The Assassins" by Edmond Hamilton.
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Cover by Walter Popp. Includes "The Conditioned Captain" by Fletcher Pratt.
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Includes "Solomon's Stone" by L. Sprague de Camp.
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"Five Fathoms Dead" by Kenneth Robeson.
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Cover by Jack Coggins. Includes "Asylum Earth" by Bruce Elliott.
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Includes "The Sky Ring" by Maxwell Grant.
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Cover by Rogers. Includes "Slan" part 1 by A. E. van Vogt.
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Cover by Earle Bergey. Includes "House Of Many Worlds" by Sam Merwin, Jr.
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Cover by F. Tinsley. Includes "Destroyers Of The Air" by Lieut. W. M. Wood.
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"The Mystery of the Golden Skull" by Donald E. Keyhoe.
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Includes "A God In A Garden" by Theodore Sturgeon.
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"Death Rides the Midnight Patrol" by Robert J. Hogan.
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Includes "The Lonely Planet" by Murray Leinster.
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Includes "Captain Future and the Seven Space-Stones" by Edmond Hamilton.
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Cover by Virgil Finlay. Includes "The Luck Of Ignatz" by Lester del Rey.
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Features "The Pink Lady" by Kenneth Robeson.
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Includes "Hang Him High" by Norbert Davis.
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Includes "Twice In Time" by Manly Wade Wellman.
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Includes "The Deadly Dust" by William Fitzgerald.
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"Red Skies for the Squadron of Satan" by Robert J. Hogan.
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"Wings of the Black Terror" by Robert J. Hogan.
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Cover by Ed Valigursky. Includes "The Snows Of Ganymede" by Poul Anderson.
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Only issue. Cover by Brundage. Includes "The Master Of Dragons" by H. Bedford Jones.
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Cover by Walter Popp. Includes "Centaurus" by Sam Merwin, Jr.
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Cover by John Howitt. Includes "Cavern Of The Damned" by Curtis Steele.
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Includes "Webbed Hands" by Ferdinand Berthoud.
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