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
- 1,014
- Earliest
- 1687
- to 2026
- Read free
- 20%
- 201 with public full text
- With covers
- 56%
How books qualify
- Query + metadata match938
- Metadata match68
- 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
- Fiction319
- Science fiction255
- Extraterrestrial beings242
- Human-alien encounters220
- Unidentified flying objects200
- UFO127
- Alien abduction100
- Short Stories92
- Physical Sciences86
- Social Sciences83
- Astronomy and Astrophysics82
- Physics and Astronomy82
- Life on other planets79
- Space Science and Extraterrestrial Life78
- Children's fiction77
- Fiction, science fiction, general77
- Sightings and encounters77
- Juvenile fiction72
- History68
- Philosophy67
- Psychology67
- Extraterrestrial beings, fiction60
- Social Psychology52
- 未確認飛行物体46
Top languages
- English752 · 74%
- German80 · 8%
- Japanese48 · 5%
- Dutch29 · 3%
- Italian21 · 2%
Notable authors
All authors- Jacques Vallee14 in this tradition15 books
- Katherine Applegate11 books
- Virgil Finlay8 in this tradition12 books
- Bernard Le Bovier de Fontenelle8 in this tradition11 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
- 南山, 宏5 in this tradition9 books
1,014 books
- Read free
A trace of memory
Keith Laumer, Lloyd Birmingham
Date unknown
- Read free
Alien Minds
E. Everett Evans
Date unknown
- Read free
Alien Offer
Al Sevcik, Llewellyn
Date unknown
- Read free
Amateur in Chancery
George George Oliver Smith
Date unknown
- Read free
And Then the Town Took Off
Richard Wilson
Date unknown
- Read free
Beach Scene
Marshall King, Wallace Wood
Date unknown
- Read free
Beside the golden door
Henry Slesar, George Schelling
Date unknown
- Read free
Birds of a Feather
Robert Silverberg, Wallace Wood
Date unknown
- Read free
Blueblood
Jim Harmon, Wallace Wood
Date unknown
- Read free
Boarding party
Robert F Young, Virgil Finlay
Date unknown
- Read free
Break a Leg
Jim Harmon, Jack Gaughan
Date unknown
- Read free
Circus
Alan Edward Nourse
Date unknown
- Read free
Citadel of the Star Lords
Edmond Hamilton
Date unknown
- Read free
Citizen Jell
Michael Shaara, Dick Francis
Date unknown
- Read free
Common Denominator
John John Dann MacDonald, Don Hunter
Date unknown
- Read free
Community Property
Alfred Coppel
Date unknown
- Read free
D-99: a science-fiction novel
Horace Bowne Fyfe
Date unknown
- Read free
Doorstep
Keith Laumer, Bob Ritter
Date unknown
- Read free
Double Take
Wilson Parks Griffith
Date unknown
- Read free
End as a Hero
Keith Laumer, George Schelling
Date unknown
- Read free
Exploiter's End
James Causey, Jack Shapiro
Date unknown
- Read free
Export Commodity
Irving E. Cox, W. E Terry
Date unknown
- Read free
Extracts from the Galactick Almanack: Music Around the Universe
Laurence M Janifer, Don Martin
Date unknown
- Read free
Federal Bureau of Investigation FOIA Documents - Unidentified Flying Objects
United States. Federal Bureau of Investigation
Date unknown