M Series
- M-101 SF Leigh Brackett The Secret of Sinharat / People of the Talisman (1964)
- M-103 SF Fred Saberhagen The Golden People / Lan Wright Exile From Xanadu (1964)
- M-105 SF Margaret St. Clair Message From the Eocene / Three Worlds of Futury (1964)
- M-107 SF A. Bertram Chandler The Coils of Time / Into The Alternate Universe (1964)
- M-109 SF G.C. Edmondson Stranger Than You Think / The Ship That Sailed the Time Stream (1965)
- M-111 SF Edmond Hamilton Fugitive of the Stars / Kenneth Bulmer Land Beyond the Map (1965)
- M-113 SF Damon Knight Off Center / The Rithian Terror (1965)
- M-115 SF John Brunner The Repairmen of Cyclops / Enigma From Tantalus (1965)
- M-117 SF Bruce W. Ronald Our Man in Space / Jack Sharkey Ultimatum in 2050 A.D. (1965)
- M-121 SF Emil Petaja Alpha Yes, Terra No! / Samuel R. Delany The Ballad of Beta-2 (1965)
- M-123 SF John Brunner The Altar on Asconel / Ted White Android Avenger (1965)
- M-125 SF Jack Vance Monsters in Orbit / The World Between and Other Stories (1965)
- M-127 SF John Rackham We, The Venusians / Fred Saberhagen The Water of Thought (1965)
- M-129 SF A. Bertram Chandler The Alternate Martians / A. Bertram Chandler Empress of Outer Space (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-135 SF Philip E. High The Mad Metropolis / Murray Leinster Space Captain (1966)
- M-139 SF Samuel R. Delany Empire Star / Tom Purdom The Tree Lord of Imeton (1966)
- M-141 SF Jack Vance The Brains of Earth / The Many Worlds of Magnus Ridolph (1966)
Read more about this topic: List Of Ace SF Double Titles
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