Books about Extraterrestrial beings -- Fiction (sorted by popularity)
- Operation Terror Murray Leinster 87 downloads
- The silent invaders Robert Silverberg 87 downloads
- Extracts from the Galactick Almanack: Music Around the Universe Laurence M. Janifer 85 downloads
- Beside the golden door Henry Slesar 84 downloads
- Keep Your Shape Robert Sheckley 83 downloads
- The Star Mouse Fredric Brown 82 downloads
- Second Landing F. L. Wallace 81 downloads
- One Against the Moon Donald A. Wollheim 79 downloads
- Birds of a Feather Robert Silverberg 78 downloads
- Savage Galahad Bryce Walton 75 downloads
- The Measure of a Man Randall Garrett 73 downloads
- Not Fit for Children Evelyn E. Smith 73 downloads
- Star-Crossed Lover William W. Stuart 73 downloads
- Alien Minds E. Everett Evans 72 downloads
- Amateur in Chancery George O. Smith 72 downloads
- Planet of the Gods Robert Moore Williams 72 downloads
- A Transmutation of Muddles H. B. Fyfe 71 downloads
- The Test Colony Winston K. Marks 71 downloads
- Daughter Philip José Farmer 70 downloads
- The Course of Logic Lester Del Rey 70 downloads
- Today is Forever Roger D. Aycock 69 downloads
- Growing up on Big Muddy Charles V. De Vet 68 downloads
- The Link Alan Edward Nourse 68 downloads
- Star of Rebirth Bernard Wall 65 downloads
- Exploiter's End James Causey 64 downloads