Origin of Species
Robert F. Young
Nine Hundred Grandmothers
R. A. Lafferty
The Moon Is a Harsh Mistress
Robert A. Heinlein
Moon Duel
Fritz Leiber
Meeting on Kangshan
Eric Frank Russell
The Mathenauts
Norman Kagan
The Mother Ship
James Tiptree, Jr.
Like Banquo's Ghost
Larry Niven
The Iron Thorn
Algis Budrys
In the Bone
Gordon R. Dickson