Books about Life on other planets -- Fiction (sorted by popularity)
- Med Ship Man Murray Leinster 159 downloads
- The great illusion Manly Banister 156 downloads
- Star Ship Poul Anderson 153 downloads
- The Radio Planet Ralph Milne Farley 149 downloads
- Eight Keys to Eden Mark Clifton 137 downloads
- This World Is Taboo Murray Leinster 137 downloads
- Slave Planet Laurence M. Janifer 136 downloads
- Bleekman's Planet Randall Garrett and Robert Silverberg 133 downloads
- Spacerogue Robert Silverberg 130 downloads
- Pariah Planet Murray Leinster 128 downloads
- The Masked World Jack Williamson 127 downloads
- Between the dark and the daylight Algis Budrys 121 downloads
- No-Risk Planet Stephen Marlowe 120 downloads
- The Gods of Mars Edgar Rice Burroughs 117 downloads
- The overlord's thumb Robert Silverberg 115 downloads
- An Earthman on Venus (Originally titled "The Radio Man") Ralph Milne Farley 110 downloads
- Cultural Exchange Keith Laumer 107 downloads
- The Planet Savers Marion Zimmer Bradley 107 downloads
- The missionary Jesse F. Bone 106 downloads
- World of the Mad Poul Anderson 106 downloads
- The Virgin of Valkarion Poul Anderson 104 downloads
- Planet of Doom Stephen Marlowe 103 downloads
- Exploration Team Murray Leinster 102 downloads
- The Hero Elaine Wilber 100 downloads
- Tiger by the Tail Poul Anderson 100 downloads