Books about Extraterrestrial beings -- Fiction (sorted by popularity)
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- 30-day wonder Richard Wilson 955 downloads
- The colour out of space H. P. Lovecraft 564 downloads
- The Sex Life of the Gods M. E. Knerr 381 downloads
- The master mind of Mars Edgar Rice Burroughs 193 downloads
- The Black Star Passes Jr. John W. Campbell 166 downloads
- Islands of Space Jr. John W. Campbell 162 downloads
- The Aliens Murray Leinster 159 downloads
- The Star Mouse Fredric Brown 134 downloads
- Triplanetary E. E. Smith 130 downloads
- Star Surgeon Alan Edward Nourse 125 downloads
- Pictures Don't Lie Katherine MacLean 114 downloads
- Daughter Philip José Farmer 113 downloads
- The Onslaught from Rigel Fletcher Pratt 97 downloads
- Beside the golden door Henry Slesar 96 downloads
- The Winds of Time James H. Schmitz 94 downloads
- Man of Many Minds E. Everett Evans 91 downloads
- One Against the Moon Donald A. Wollheim 87 downloads
- Keep Your Shape Robert Sheckley 82 downloads
- D-99: a science-fiction novel H. B. Fyfe 79 downloads
- Ten From Infinity Paul W. Fairman 77 downloads
- If You Was a Moklin Murray Leinster 75 downloads
- Not Fit for Children Evelyn E. Smith 75 downloads
- Doorstep Keith Laumer 74 downloads
- Citadel of the Star Lords Edmond Hamilton 70 downloads
- The Measure of a Man Randall Garrett 68 downloads
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