Books about Human-alien encounters -- Fiction (sorted by popularity)
- Triplanetary E. E. Smith 157 downloads
- Student Body F. L. Wallace 154 downloads
- 30-day wonder Richard Wilson 152 downloads
- Communication Charles L. Fontenay 152 downloads
- The expendables A. E. Van Vogt 149 downloads
- If You Was a Moklin Murray Leinster 147 downloads
- Pictures Don't Lie Katherine MacLean 147 downloads
- Referent Ray Bradbury 138 downloads
- Crisis! C. M. Kornbluth 137 downloads
- We're Civilized! Mark Clifton and Alex Apostolides 136 downloads
- The World That Couldn't Be Clifford D. Simak 133 downloads
- The Repairman Harry Harrison 131 downloads
- The Aab Edward W. Ludwig 130 downloads
- The Winds of Time James H. Schmitz 129 downloads
- Nobody saw the ship Murray Leinster 128 downloads
- Naudsonce H. Beam Piper 128 downloads
- Attitude Hal Clement 127 downloads
- The Tree of Life C. L. Moore 125 downloads
- The high ones Poul Anderson 125 downloads
- A world to die for Sam Carson 124 downloads
- Harwood's Vortex Robert Silverberg 123 downloads
- The Sentimentalists Murray Leinster 123 downloads
- The Jameson Satellite Neil R. Jones 123 downloads
- The Stranger Gordon R. Dickson 122 downloads
- Once a Greech Evelyn E. Smith 122 downloads