Contraption
Clifford D. Simak
Convergent Series
Larry Niven
Country Doctor
William Morrison
Critical Factor
Hal Clement
A Cross of Centuries
Henry Kuttner
A Cupful of Space
Mildred Clingerman
Custom Fitting
James White
Cycle of Fire
Dance of the Dead
Richard Matheson
Danger! Child at Large
Charles Cottrell
Dare
Philip José Farmer
Dark Dominion
David Duncan
The Dark Night of the Soul
James Blish
Dark Star
Alan Dean Foster
Deadly Litter
The Deserter
William Tenn