Books about Life on other planets -- Fiction (sorted alphabetically)
- Garden of Evil Margaret St. Clair
- Gods of Mars Edgar Rice Burroughs
- Gods of Mars Edgar Rice Burroughs
- Gods of Mars Edgar Rice Burroughs
- Gods of Mars Edgar Rice Burroughs
- Governor of Glave Keith Laumer
- Gray Lensman E. E. Smith
- great illusion Manly Banister
- Green World Hal Clement
- guerre des mondes (French) H. G. Wells
- Hero Elaine Wilber
- Hunt the Hog of Joe Robert E. Gilbert
- In the Garden R. A. Lafferty
- Klygha H. B. Fyfe
- last days of the captain Kate Wilhelm
- last space ship Murray Leinster
- Lord of Death and the Queen of Life Homer Eon Flint
- Lunarian Professor and His Remarkable Revelations Concerning the Earth, the Moon and Mars James B. Alexander
- Madman From Earth Keith Laumer
- Marsin jumalat: Seikkailuromaani (Finnish) Edgar Rice Burroughs
- Masked World Jack Williamson
- master mind of Mars Edgar Rice Burroughs
- Matter of Protocol Jack Sharkey
- Med Ship Man Murray Leinster
- Meleager : A fantasy Herbert M. Vaughan