Books about Extraterrestrial beings -- Fiction (sorted by popularity)
- Peacemaker Alan Edward Nourse 68 downloads
- On the Fourth Planet Jesse F. Bone 67 downloads
- Indirection Everett B. Cole 67 downloads
- Keep Your Shape Robert Sheckley 66 downloads
- The Onslaught from Rigel Fletcher Pratt 64 downloads
- Doorstep Keith Laumer 64 downloads
- A Transmutation of Muddles H. B. Fyfe 61 downloads
- The Sentimentalists Murray Leinster 61 downloads
- The Star Mouse Fredric Brown 60 downloads
- The silent invaders Robert Silverberg 60 downloads
- Out Around Rigel Robert H. Wilson 59 downloads
- Boarding party Robert F. Young 58 downloads
- Operation Terror Murray Leinster 57 downloads
- A Bad Day for Vermin Keith Laumer 57 downloads
- Extracts from the Galactick Almanack: Music Around the Universe Laurence M. Janifer 57 downloads
- Sweet Tooth Robert F. Young 57 downloads
- Amateur in Chancery George O. Smith 56 downloads
- The Invader Alfred Coppel 56 downloads
- One Against the Moon Donald A. Wollheim 56 downloads
- Beside the golden door Henry Slesar 55 downloads
- Planet of the Gods Robert Moore Williams 55 downloads
- The Birds of Lorrane William R. Doede 54 downloads
- Fifteen Hundred Miles an Hour Charles Dixon 54 downloads
- The Course of Logic Lester Del Rey 54 downloads
- Break a Leg Jim Harmon 53 downloads