Books about Extraterrestrial beings -- Fiction (sorted by popularity)
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- The colour out of space H. P. Lovecraft 510 downloads
- The Sex Life of the Gods M. E. Knerr 425 downloads
- Ten From Infinity Paul W. Fairman 180 downloads
- The master mind of Mars Edgar Rice Burroughs 164 downloads
- Pictures Don't Lie Katherine MacLean 136 downloads
- Islands of Space Jr. John W. Campbell 131 downloads
- Star Surgeon Alan Edward Nourse 127 downloads
- The Aliens Murray Leinster 124 downloads
- Peace Norman Arkawy and Stanley Henig 108 downloads
- The Black Star Passes Jr. John W. Campbell 106 downloads
- Triplanetary E. E. Smith 106 downloads
- If You Was a Moklin Murray Leinster 102 downloads
- Man of Many Minds E. Everett Evans 100 downloads
- The Winds of Time James H. Schmitz 96 downloads
- The Star Mouse Fredric Brown 88 downloads
- D-99: a science-fiction novel H. B. Fyfe 87 downloads
- Common Denominator John D. MacDonald 81 downloads
- 30-day wonder Richard Wilson 79 downloads
- On the Fourth Planet Jesse F. Bone 77 downloads
- The Green World Hal Clement 76 downloads
- Citadel of the Star Lords Edmond Hamilton 75 downloads
- Peacemaker Alan Edward Nourse 74 downloads
- Last Night Out Milton A. Rothman 74 downloads
- Boarding party Robert F. Young 73 downloads
- Doorstep Keith Laumer 70 downloads
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