Books about Human-alien encounters -- Fiction (sorted by popularity)
- The hellflower George O. Smith 112 downloads
- Der rote Stern: Ein utopischer Roman (German) A. Bogdanov 112 downloads
- Perfect Answer Jr. L. J. Stecher 112 downloads
- Corpus earthling Louis Charbonneau 111 downloads
- The high ones Poul Anderson 111 downloads
- 30-day wonder Richard Wilson 110 downloads
- If You Was a Moklin Murray Leinster 110 downloads
- Tiger by the Tail Poul Anderson 110 downloads
- My Fair Planet Evelyn E. Smith 110 downloads
- When the atoms failed Jr. John W. Campbell 109 downloads
- The Madman From Earth Keith Laumer 109 downloads
- The Stranger Gordon R. Dickson 108 downloads
- A Matter of Protocol Jack Sharkey 108 downloads
- The Weirdest World R. A. Lafferty 108 downloads
- The Five Hells of Orion Frederik Pohl 107 downloads
- Retief of the Red-Tape Mountain Keith Laumer 107 downloads
- The Lamps of the Angels Richard Sabia 107 downloads
- Colossus of Chaos Nelson S. Bond 107 downloads
- Student Body F. L. Wallace 107 downloads
- Half past Alligator Donald Colvin 106 downloads
- Clean Break Roger D. Aycock 106 downloads
- "Shadrach" Nelson S. Bond 106 downloads
- Mr. Meek Plays Polo Clifford D. Simak 105 downloads
- Common Denominator John D. MacDonald 104 downloads
- Heel Philip José Farmer 104 downloads