Books about Human-alien encounters -- Fiction (sorted by popularity)
- The Madcap Metalloids Verne Athanas 124 downloads
- The Vanishing Venusians Leigh Brackett 122 downloads
- Battle for the Stars Edmond Hamilton 122 downloads
- Cinderella Story Allen Kim Lang 122 downloads
- The Green World Hal Clement 122 downloads
- Task of Kayin Joseph Samachson 121 downloads
- Cry from a Far Planet Tom Godwin 121 downloads
- Child of the Sun Leigh Brackett 121 downloads
- Attitude Hal Clement 121 downloads
- The Lonely Ones Edward W. Ludwig 120 downloads
- Tiger by the Tail Poul Anderson 119 downloads
- A time to die Harold Calin 119 downloads
- Prodigal Weapon Bill Garson 119 downloads
- Meteor-Men of Mars Harry Cord and Otis Adelbert Kline 118 downloads
- Message From Mars Clifford D. Simak 118 downloads
- Advance Agent Christopher Anvil 118 downloads
- Les Xipéhuz (French) aîné J.-H. Rosny and jeune J.-H. Rosny 118 downloads
- End as a Hero Keith Laumer 117 downloads
- The Invaders Murray Leinster 117 downloads
- The Barbarians Tom Godwin 117 downloads
- Aide Memoire Keith Laumer 117 downloads
- The eternal quest Joseph Gilbert 116 downloads
- Pogo Planet Donald A. Wollheim 116 downloads
- Lunar Station Harl Vincent 116 downloads
- The passionate pitchman Stephen Marlowe 116 downloads