Books about Outer space -- Exploration -- Fiction (sorted by popularity)
- Quinquepedalian Piers Anthony 56 downloads
- Task Mission Fox B. Holden 55 downloads
- Beware the Star Gods S. J. Byrne 55 downloads
- The Burnt Planet William J. Brittain 55 downloads
- The Upside-Down Captain Jim Harmon 55 downloads
- Dust Unto Dust Lyman D. Hinckley 53 downloads
- Beast of prey Jay Williams 53 downloads
- The Contact Point Jack Sharkey 52 downloads
- It Hayden Howard 51 downloads
- Willie's Planet Mike Ellis 51 downloads
- Captain Chaos D. Allen Morrissey 48 downloads
- Skit-tree planet Murray Leinster 47 downloads
- The Voyage of Vanishing Men Stanley Mullen 47 downloads
- The Conquistadors Come Mary Elizabeth Counselman 46 downloads
- Doomsday on Ajiat Neil R. Jones 42 downloads