Four-Day Planet
H. Beam Piper
Federation (1)
Oomphel in the Sky
Treasure of Tau Ceti
John T. Phillifent
Alien Sea
Poseidon Project
Hell-Planet
The Double Invaders
Lord of the Green Planet
Emil Petaja
The Green Planet (1)
Saga of Lost Earths
The Kalevala (1)
The Star Mill
The Kalevala (2)