Books about Human-alien encounters -- Fiction (sorted by popularity)
- The Brain Sinner Alan Edward Nourse 38 downloads
- To Save Earth Edward W. Ludwig 38 downloads
- Ultimatum Roger D. Aycock 37 downloads
- Secret of the Martians Paul W. Fairman 37 downloads
- The eternal quest Joseph Gilbert 37 downloads
- Spoilers of the Spaceways W. Bradford Martin 37 downloads
- The Useless Bugbreeders James Stamers 37 downloads
- The Margenes Miriam Allen De Ford 37 downloads
- The Conquistadors Come Mary Elizabeth Counselman 37 downloads
- Peril of the Starmen Kris Neville 37 downloads
- Uniform of a Man Dave Dryfoos 37 downloads
- You Don't Walk Alone Frank M. Robinson 37 downloads
- The Best of Fences Randall Garrett 37 downloads
- The Man From Siykul Richard Wilson 37 downloads
- The Martians and the Coys Mack Reynolds 36 downloads
- The Lights on Precipice Peak Stephen Tall 36 downloads
- Get Out of My Body! Tom W. Harris 36 downloads
- Citadel of the Green Death Robert Emmett McDowell 36 downloads
- Stellar Vengeance Frank Freeman 36 downloads
- The Monster That Threatened the Universe R. R. Winterbotham 36 downloads
- As It Was Paul L. Payne 36 downloads
- The Customs Lounge Annie Proulx 36 downloads
- Crisis! C. M. Kornbluth 36 downloads
- Always a Qurono Jim Harmon 35 downloads
- Beyond our control Randall Garrett 35 downloads