Books about Human-alien encounters -- Fiction (sorted by popularity)
- The Green World Hal Clement 83 downloads
- The Weirdest World R. A. Lafferty 81 downloads
- Beyond Light Nelson S. Bond 81 downloads
- Colossus of Chaos Nelson S. Bond 80 downloads
- The Course of Logic Lester Del Rey 80 downloads
- An eye for the ladies Stephen Marlowe 79 downloads
- The Vanishing Venusians Leigh Brackett 78 downloads
- Biddy and the silver man Harlan Ellison 78 downloads
- Diplomatic Immunity Robert Sheckley 78 downloads
- And Then the Town Took Off Richard Wilson 78 downloads
- Terror Out of Space Leigh Brackett 77 downloads
- Clean Break Roger D. Aycock 77 downloads
- The Dark Goddess Richard S. Shaver 76 downloads
- Goddess of the Moon John Murray Reynolds 76 downloads
- Return Engagement Margaret St. Clair 76 downloads
- Left hand, right hand James H. Schmitz 76 downloads
- "Shadrach" Nelson S. Bond 75 downloads
- Advance Agent Christopher Anvil 75 downloads
- The Double Spy Dan T. Moore 75 downloads
- Who Goes There? Charles H. Davis 74 downloads
- The Good Neighbors Edgar Pangborn 73 downloads
- The Stranger Gordon R. Dickson 73 downloads
- Quinquepedalian Piers Anthony 73 downloads
- What's He Doing in There? Fritz Leiber 73 downloads
- My Fair Planet Evelyn E. Smith 73 downloads