Call of the Savage
Otis Adelbert Kline
Jan of the Jungle (1)
Jan of the Jungle
Jan of the Jungle (The Call of the Savage)
The Malignant Entity
Dr. Dorp (1)
The Man from the Moon
Maza of the Moon
The Metal Monster
The Outlaws of Mars
Swordsman of Mars (2)
The Port of Peril
Grandon (3)
Prince of Peril
Grandon (2)
The Prince of Peril
Revenge of the Robot
Spawn of the Comet
Stolen Centuries
The Swordsman of Mars
Swordsman of Mars (1)
The Thing That Walked in the Rain
A Vision of Venus