Books about Extraterrestrial beings -- Fiction (sorted by popularity)
- The Vegans Were Curious Winston K. Marks 110 downloads
- The silent invaders Robert Silverberg 108 downloads
- A Transmutation of Muddles H. B. Fyfe 106 downloads
- D-99: a science-fiction novel H. B. Fyfe 106 downloads
- Special Delivery Kris Neville 106 downloads
- Savage Galahad Bryce Walton 105 downloads
- Citadel of the Star Lords Edmond Hamilton 105 downloads
- The Green World Hal Clement 104 downloads
- If You Was a Moklin Murray Leinster 102 downloads
- Common Denominator John D. MacDonald 100 downloads
- Doorstep Keith Laumer 98 downloads
- Peacemaker Alan Edward Nourse 97 downloads
- On the Fourth Planet Jesse F. Bone 97 downloads
- Boarding party Robert F. Young 94 downloads
- The guest rites Robert Silverberg 94 downloads
- End as a Hero Keith Laumer 94 downloads
- Out Around Rigel Robert H. Wilson 92 downloads
- Beside the golden door Henry Slesar 89 downloads
- Birds of a Feather Robert Silverberg 88 downloads
- Growing up on Big Muddy Charles V. De Vet 88 downloads
- Extracts from the Galactick Almanack: Music Around the Universe Laurence M. Janifer 88 downloads
- One Against the Moon Donald A. Wollheim 87 downloads
- Fifteen Hundred Miles an Hour Charles Dixon 87 downloads
- The Last Monster Gardner F. Fox 87 downloads
- The Unwilling Professor Arthur Porges 86 downloads