Impact
Irving E. Cox, Jr.
Cosmic Checkmate
Katherine MacLean & Charles V. De Vet
Kalin Trobt (1)
Inside Outside
Philip José Farmer
Tongues of the Moon
The Maker of Universes
The World of Tiers (1)
The Gates of Creation
The World of Tiers (2)
The Gate of Time
A Private Cosmos
The World of Tiers (3)
A Feast Unknown
Secrets of the Nine (1)
Night of Light
Father Carmody (1)