Quinquepedalian
Piers Anthony
The Rebel Worlds
Poul Anderson
Dominic Flandry (8)
The Corridors of Time
The Star Fox
Gunnar Heim (1)
Three Worlds to Conquer
Sam Hall Universe (1)
Industrial Revolution
Flying Mountains (1)
After Doomsday
The High Crusade
The Burning Bridge
History of Rustum (3)
Ten Years to Doomsday
Chester Anderson & Michael Kurland
The Dark Light Years
Brian W. Aldiss