The Replicators
A. E. Van Vogt
Meeting on Kangshan
Eric Frank Russell
Raindrop
Hal Clement
Research Alpha
James H. Schmitz & A. E. Van Vogt
Moon Duel
Fritz Leiber
Under Two Moons
Frederik Pohl
Origin of Species
Robert F. Young
Tiger Green
Gordon R. Dickson
Toys for Debbie
David A. Kyle
The Moon Is a Harsh Mistress
Robert A. Heinlein