The Outlaws of Mars
Otis Adelbert Kline
Swordsman of Mars (2)
The Prince of Peril
Grandon (2)
The Port of Peril
Grandon (3)
The Five Jars
M. R. James
Ole Doc Methuselah
L. Ron Hubbard
Ole Doc Methuselah (1)
Slaves of Sleep
Slaves of Sleep (1)
The Dangerous Dimension
Gladiator
Philip Wylie
The Hour of the Dragon
Robert E. Howard
Conan Universe (1)
Almuric
Wings in the Night
Solomon Kane (1932)
The Night Land
William Hope Hodgson
Beyond the Thunder
H. B. Hickey
Rocket Ship Galileo
Robert A. Heinlein
Adventures in Time and Space
Raymond J. Healy & J. F. McComas
The Valley of Creation
Edmond Hamilton
The Star Kings
Star Kings (1)
Calling Captain Future
Captain Future (2)
A Yank at Valhalla
Zarlah the Martian
R. Norman Grisewood