The 13th Immortal
Robert Silverberg
Ace Double (223)
Stepsons of Terra
Ace Double (311)
Doomsday Eve
Robert Moore Williams
Ace Double (215)
A Man Called Destiny
Lan Wright
The Void Beyond, and Other Stories
Ace Double D-322 (1)
The Door Through Space
Marion Zimmer Bradley
Ace Double F (117)
The Mad Metropolis
Philip E. High
Ace Double M (135)
Our Man in Space
Bruce W. Ronald
Ace Double M (117)
The Hidden Planet
Donald A. Wollheim
AceD354 (1)
The Flying Saucer Gambit
Jack Owen Jardine
Agent of T.E.R.R.A. (1)
The Golden Goddess Gambit
Agent of T.E.R.R.A. (2)
The Time Trap Gambit
Agent of T.E.R.R.A. (4)
The Emerald Elephant Gambit
Agent of T.E.R.R.A. (3)