The Clue in the Crumbling Wall
Carolyn Keene
All You Need Is Love
Peter Brown
Yoga for a World Out of Balance
Michael Stone
Camp-Fire and Cotton-Field
Thomas W. Knox
N-Space
Larry Niven
Juggler of Worlds
Larry Niven; Edward M. Lerner
The integral trees: and, The smoke ring
Escape from Hell
Larry Niven; Jerry Pournelle