M-101 LEIGH BRACKETT The Secret of Sinharat (cover and interior sketches by Emsh; 1964; listed as "Complete Novel") and M-101b LEIGH BRACKETT People of the Talisman (cover and interior sketches by Emsh; 1964; listed as "First Book Publication")
M-103 FRED SABERHAGEN The Golden People (cover by Jack Gaughan; 1964; listed as "Complete Novel") and M-103b IAN WRIGHT Exile From Xanadu (cover and interior sketch by Emsh; 1964; listed as "First Book Publication")
M-105 MARGARET St. CLAIR Message From The Eocene (cover by Jack Gaughan; 1964) and M-105b MARGARET St. CLAIR Three Worlds of Futurity (cover by Jack Gaughan; 1964)
M-107 A. BERTRAM CHANDLER The Coils of Time (cover by Jack Gaughan; 1964) and M-107b A. BERTRAM CHANDLER Into the Alternate Universe (cover by Ed Valigursky; 1964)
M-109 G. C. EDMONDSON (aka JOSE MARIO GARY ORDONEZ EDMONDSON) Stranger Than You Think (cover by Jack Gaughan; 1965) and M-109b G. C. EDMONDSON (aka JOSE MARIO GARY ORDONEZ EDMONDSON) The Ship That Sailed the Time Stream (cover by Jack Gaughan; 1965; listed as "First Book Publication")
M-111 KENNETH BULMER Land Beyond the Map (cover by Jerome Podwil; 1965; listed as "Complete Novel") and M-111b EDMOND HAMILTON Fugitive of the Stars (cover by Jack Gaughan; 1965; listed as "First Book Publication")
M-113 DAMON KNIGHT Off Center: A Scintillating Science-Fiction Collection (cover and five small illustrations by Jack Gaughan; 1965) and DAMON KNIGHT The Rithian Terror (1965; cover and frontspiece by Jack Gaughan; 1965; listed as "Complete Novel")
M-115 JOHN BRUNNER The Repairmen of Cyclops (cover by Jack Gaughan; 1965) and M-115b JOHN BRUNNER Enigma From Tantalus (cover by John Schoenherr; interior illustrations by Emsh and Jack Gaughan; 1965)
M-117 JACK SHARKEY (aka JOHN MICHAEL SHARKEY) Ultimatum in 2050 A.D. (cover by John Schoenherr; 1965; listed as "First Book Publication") and M-117b BRUCE W. RONALD Our Man in Space (cover by Ed Valigursky; 1965; listed as "Complete Novel")
M-121 EMIL PETAJA Alpha Yes, Terra No! (cover by Jack Gaughan; 1965; listed as "First Book Publication") and M-121b SAMUEL R. DELANY The Ballad of Beta-2 (cover by Ed Valigursky;1965; listed as "Complete Novel")
M-123 TED WHITE Android Avenger (cover by Ed Valigursky; 1965; listed as "Complete Novel") and M-123b JOHN BRUNNER The Altar at Asconel (cover by Gray Morrow; signed lower right; 1965; listed as "First Book Publication")
M-125 JACK VANCE (aka JOHN HOLBROOK VANCE) Monsters in Orbit (1965; listed as "First Book Publication") and M-125b JACK VANCE The World Between and Other Stories (1965; cover by Jack Gaughan)
M-127 JOHN RACKHAM (aka JOHN T. PHILLIFENT) We, The Venusians (cover by Jack Gaughan; 1965) and M-127b FRED SABERHAGEN The Water of Thought (1965; listed as "Complete Novel")
M-129 A. BERTRAM CHANDLER The Alternate Martians (cover by Jerome Podwil; 1965; listed as "First Book Publication") and M-129b A. BERTRAM CHANDLER Empress of Outer Space (cover by Jerome Podwil; 1965; listed as "Complete Novel")
M-131 KENNETH BULMER Behold the Stars (1965; listed as "First Book Publication") and M-131b MACK REYNOLDS Planetary Agent X (cover by Jack Gaughan; 1965; listed as "Complete Novel")
M-133 A. BERTRAM CHANDLER Space Mercenaries (cover by Gray Morrow and frontspiece illustration by Jack Gaughan; 1965; listed as "Complete Novel") and M-133b EMIL PETAJA The Caves of Mars (cover by Alex Schomburg and frontspiece illustration by Jack Gaughan; 1965; listed as "First Book Publication")
M-135 PHILIP E. HIGH The Mad Metropolis (cover and interior illustration by Jack Gaughan; 1966; listed as "Complete Novel") and MURRAY LEINSTER (aka WILL F. JENKINS) Space Captain (cover by Gray Morrow; 1966; listed as "First Book Publication")
M-139 SAMUEL R.DELANY Empire Star (cover by Jack Gaughan;1966; listed as "Complete Novel") and M-139b TOM PURDOM The Tree Lord of Imeten (cover by John Schoenherr; 1966; listed as "First Book Publication")
M141 JACK VANCE (aka JOHN HOLBROOK VANCE) The Brains of Earth (cover by Jack Gaughan - unaccredited; 1966; listed as "first book publication") and M141b JACK VANCE The Many Worlds of Magnus Ridolph (cover by Jack Gaughan; 1966; listed as "First Book Publication")