The Second IF Reader of Science Fiction

In the Arena, 1963, Brian W. Aldiss
The Billiard Ball, 1967, Isaac Asimov
The Time-Tombs, 1963, J. G. Ballard
"Die, Shadow!", 1963, Algis Budrys
The Foundling Stars, 1966, Hal Clement
Toys for Debbie, 1965, David A. Kyle
Forest in the Sky, [Retief], 1967, Keith Laumer
At the Core, [Known Space], 1966, Larry Niven
Under Two Moons, 1965, Frederik Pohl
Masque of the Red Shift, [Berserker], 1965, Fred Saberhagen