The Alternate Martians
A. Bertram Chandler
Empress of Outer Space
Empress Irene (1)
Into the Alternate Universe
John Grimes Rimworld (12)
The Ship from Outside
John Grimes Rimworld (3)
Rendezvous on a Lost World
John Grimes Rimworld (19)
The Wizard of Starship Poseidon
Kenneth Bulmer
Worlds for the Taking
The Million Year Hunt
Listen! The Stars!
John Brunner
Alpha Centauri or Die!
Leigh Brackett