Books about Extraterrestrial beings -- Fiction (sorted by popularity)
- Common Denominator John D. MacDonald 107 downloads
- The Green World Hal Clement 106 downloads
- Laboratory Jerome Bixby 103 downloads
- D-99: a science-fiction novel H. B. Fyfe 102 downloads
- Special Delivery Kris Neville 102 downloads
- Doorstep Keith Laumer 101 downloads
- The guest rites Robert Silverberg 101 downloads
- The silent invaders Robert Silverberg 99 downloads
- A Transmutation of Muddles H. B. Fyfe 98 downloads
- Fifteen Hundred Miles an Hour Charles Dixon 96 downloads
- The green girl Jack Williamson 94 downloads
- Birds of a Feather Robert Silverberg 92 downloads
- On the Fourth Planet Jesse F. Bone 91 downloads
- Extracts from the Galactick Almanack: Music Around the Universe Laurence M. Janifer 90 downloads
- The Vegans Were Curious Winston K. Marks 90 downloads
- Out Around Rigel Robert H. Wilson 89 downloads
- Planet of the Gods Robert Moore Williams 88 downloads
- Growing up on Big Muddy Charles V. De Vet 87 downloads
- Star-Crossed Lover William W. Stuart 86 downloads
- The Last Monster Gardner F. Fox 86 downloads
- End as a Hero Keith Laumer 86 downloads
- One Against the Moon Donald A. Wollheim 86 downloads
- Boarding party Robert F. Young 84 downloads
- Peacemaker Alan Edward Nourse 84 downloads
- Citizen Jell Michael Shaara 83 downloads