Tradition 20 of 33
UFOs, extraterrestrials, and contact
UFO/UAP reports, flying saucers, extraterrestrial life, alien contact or abduction, contactees, and ancient-astronaut claims.
Membership means relevance, not endorsement.
- Books
- 1,058
- Earliest
- 1558
- to 2026
- Read free
- 22%
- 236 with public full text
- With covers
- 58%
How books qualify
- Query + metadata match981
- Metadata match69
- Query match7
- Source classification (retained through merging)1
Every placement records its evidence — the controlled subject queries that found the book at its sources and the bibliographic metadata retained through merging. Each book page shows its own. How the rationale system works.
Key subjects
- Fiction324
- Science fiction258
- Extraterrestrial beings247
- Human-alien encounters220
- Unidentified flying objects204
- UFO128
- Alien abduction101
- Short Stories92
- Physical Sciences86
- Social Sciences83
- Astronomy and Astrophysics82
- Physics and Astronomy82
- Life on other planets81
- Children's fiction80
- Sightings and encounters79
- Space Science and Extraterrestrial Life78
- Fiction, science fiction, general77
- Juvenile fiction74
- History69
- Philosophy68
- Psychology68
- Extraterrestrial beings, fiction62
- Social Psychology52
- 未確認飛行物体46
Top languages
- English771 · 73%
- German85 · 8%
- Japanese48 · 5%
- French31 · 3%
- Dutch29 · 3%
Notable authors
All authors- Jacques Vallee14 in this tradition15 books
- Katherine Applegate12 books
- M. de Fontenelle11 in this tradition12 books
- Bernard Le Bovier de Fontenelle9 in this tradition15 books
- Virgil Finlay8 in this tradition12 books
- Ed Emshwiller7 in this tradition11 books
- George Adamski7 books
- Orson Scott Card6 in this tradition8 books
- Pittacus Lore6 in this tradition7 books
- Donald E. Keyhoe6 books
- Marissa Meyer6 books
- Robert A. Heinlein6 books
1,058 books
- Read free
The Gift Bearer
Charles L Fontenay
Date unknown
- Read free
The Green World
Hal Clement, John Giunta
Date unknown
- Read free
The Invader
Alfred Coppel
Date unknown
- Read free
The Klygha
Horace Bowne Fyfe, George Schelling
Date unknown
- Read free
The Last Monster
Gardner Gardner Francis Fox, Graham Ingels
Date unknown
- Read free
The Link
Alan Edward Nourse
Date unknown
- Read free
The Lonely
Judith Merril, Virgil Finlay, Lutjens
Date unknown
- Read free
The Measure of a Man
Randall Garrett
Date unknown
- Read free
The Missing Disclaimer
Samuel Samuel John Sackett
Date unknown
- Read free
The Monster That Threatened the Universe
Russell Robert Winterbotham, Don Lynch
Date unknown
- Read free
The Next Time We Die
Robert Moore Williams
Date unknown
- Read free
The Pure Observers
B. J Rogers, Kelly Freas
Date unknown
- Read free
The Roswell Report: Case Closed
James McAndrew
Date unknown
- Read free
The Seeder
Max Williams
Date unknown
- Read free
The Sentimentalists
Murray Leinster
Date unknown
- Read free
The Serpent River
Don Wilcox
Date unknown
- Read free
The Sex Life of the Gods
Michael E. Knerr
Date unknown
- Read free
The Smiler
Albert Hernhuter
Date unknown
- Read free
The Star Mouse
Fredric Brown, Don Lynch
Date unknown
- Read free
The Sword
Frank Quattrocchi, Tom Beecham
Date unknown
- Read free
The Test Colony
Winston Winston Kinney Marks, Kelly Freas
Date unknown
- Read free
The Time of Cold
Mary Carlson
Date unknown
- Read free
The Toy
Kris Neville
Date unknown
- Read free
The Ultimate Eve
H. Sanford Effron, Kelly Freas
Date unknown