A Planet for Texans
H. Beam Piper & John J. McGuire
Ace Double (299)
Recruit for Andromeda
Milton Lesser
Ace Double (358)
The Secret of ZI
Kenneth Bulmer
Ace Double (331)
Stepsons of Terra
Robert Silverberg
Ace Double (311)
The Void Beyond, and Other Stories
Robert Moore Williams
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 Emerald Elephant Gambit
Jack Owen Jardine
Agent of T.E.R.R.A. (3)
The Flying Saucer Gambit
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)