Books about Human-alien encounters -- Fiction (sorted by popularity)
- Invader From Infinity George A. Whittington 55 downloads
- Felony James Causey 55 downloads
- Leave, Earthmen—Or Die! John Massie Davis 55 downloads
- Unwelcomed Visitor Joseph Samachson 55 downloads
- The Giants From Outer Space Robert W. Krepps 55 downloads
- Out of Mind William W. Stuart 55 downloads
- This World is Ours! Emil Petaja 54 downloads
- The Invaders Murray Leinster 54 downloads
- Rx Alan Edward Nourse 53 downloads
- What Inhabits Me? Robert Moore Williams 53 downloads
- Shock Troop Richard Bolton 52 downloads
- Monster of the Asteroid Ray Cummings 52 downloads
- Round-Up Time Chester Cohen 51 downloads
- Bunzo Farewell Charles V. De Vet 51 downloads
- Meeting at the Summit Ivar Jorgensen 51 downloads
- The Good Neighbors Edgar Pangborn 51 downloads
- The Frightful Ones Richard Maples 51 downloads
- The Unprotected Species Melvin Sturgis 51 downloads
- Trajectory to Taurus Les Cole 51 downloads
- The Bryd Noel M. Loomis 50 downloads
- Jabberwock, Beware! Richard A. Sternbach 50 downloads
- The Little Pets of Arkkhan Bill Garson 49 downloads
- It Hayden Howard 49 downloads
- The Ambassadors From Venus Kendell Foster Crossen 49 downloads
- The Unwilling Professor Arthur Porges 49 downloads