Books about Human-alien encounters -- Fiction (sorted by popularity)
- The Last Martian Ray Van Houten 58 downloads
- Madmen of Mars Erik Fennel 58 downloads
- Travelogue Roger D. Aycock 58 downloads
- Boy meets dyevitza Robert F. Young 58 downloads
- The Little Monsters Come Ray Cummings 58 downloads
- The Hero Elaine Wilber 58 downloads
- The Terror Out of Space Dwight V. Swain 57 downloads
- Operation Terror Murray Leinster 57 downloads
- The Native Soil Alan Edward Nourse 57 downloads
- Les Xipéhuz (French) aîné J.-H. Rosny and jeune J.-H. Rosny 57 downloads
- Earth Alert! Kris Neville 57 downloads
- Problem on Balak Roger D. Aycock 57 downloads
- Savage Galahad Bryce Walton 56 downloads
- Jupiter's Joke A. L. Haley 56 downloads
- Amour, Amour, Dear Planet! Mark Clutter 56 downloads
- Gods of Space Ray Cummings 56 downloads
- Amateur in Chancery George O. Smith 56 downloads
- Child of the Sun Leigh Brackett 56 downloads
- The Huddlers William Campbell Gault 56 downloads
- A Guest of Ganymede C. C. MacApp 55 downloads
- The Dark Goddess Richard S. Shaver 55 downloads
- Coming of the Gods Chester Whitehorn 55 downloads
- Founding Father Jesse F. Bone 55 downloads
- Star-Crossed Lover William W. Stuart 55 downloads
- A Gift For Terra Fox B. Holden 55 downloads