Books about Human-alien encounters -- Fiction (sorted by popularity)
- Beast of prey Jay Williams 52 downloads
- Do Unto Others Mark Clifton 52 downloads
- The mystery of Deneb IV Robert Silverberg 52 downloads
- Definition Damon Knight 51 downloads
- Outpost on Io Leigh Brackett 51 downloads
- The Next Time We Die Robert Moore Williams 51 downloads
- The Conquistadors Come Mary Elizabeth Counselman 51 downloads
- Angel's Egg Edgar Pangborn 51 downloads
- Task Mission Fox B. Holden 51 downloads
- From outer space Robert Zacks 51 downloads
- Battle for the Stars Edmond Hamilton 51 downloads
- License to Steal Louis Newman 51 downloads
- The Klygha H. B. Fyfe 50 downloads
- Birthright April Smith 50 downloads
- Rx Alan Edward Nourse 50 downloads
- The Dancers Margaret St. Clair 50 downloads
- The Man From Siykul Richard Wilson 50 downloads
- The overlord's thumb Robert Silverberg 50 downloads
- Task of Kayin Joseph Samachson 50 downloads
- The Flame Breathers Ray Cummings 50 downloads
- Message From Mars Clifford D. Simak 50 downloads
- Today is Forever Roger D. Aycock 50 downloads
- Invader From Infinity George A. Whittington 50 downloads
- The Terror Out of Space Dwight V. Swain 49 downloads
- Uniform of a Man Dave Dryfoos 49 downloads