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 week's conversation on the plurality of worlds
M. de Fontenelle
1737
- Read free
Conversations with a lady, on the plurality of worlds
M. de Fontenelle
1719
- Read free
The Moon Maid
Edgar Rice Burroughs
1926
- Read free
The celestial worlds discover'd: or, conjectures concerning the inhabitants, plants and productions of the worlds in the planets
Constantijn Huygens
1722
- Read free
The Moon Men
Edgar Rice Burroughs
1962
- Read free
Witnessed
Budd Hopkins
1996
- Read free
A week's conversation on the plurality of worlds
Joseph Addison, Aphra Behn, M. de Fontenelle
1737
Fire in the sky
Travis Walton
1996
Forbidden science
Jacques Vallee
1992
The Mothman Prophecies
John A. Keel
1975
- Read free
Conversations on the plurality of worlds
M. de Fontenelle, William Gardiner
1715
Telepathy and clairvoyance
Rudolf E. Tischner, Rudolf Tischner
1925
Imminent
Luis Elizondo, Martin Bayer
2024
- Read free
More worlds than one
David Brewster
1854
- Read free
Blindsight
Peter Watts
2006
- Read free
The book of the damned
Charles Fort
1919
The Archaic Revival
Terence McKenna, Terence K. McKenna, Wilfried Satty, Tom Robbins
1991
- Read free
Christiani Huygenii [Kosmotheōros], sive de terris coelestibus, earumque ornatu, conjecturae
Christiaan Huygens
1699Latin
- Read free
30-day wonder
Richard Wilson, Richard M Powers
Date unknown
- Read free
A Bad Day for Vermin
Keith Laumer
Date unknown
- Read free
A City Near Centaurus
William R Doede, West
Date unknown
- Read free
A Little Knowledge
Russell Robert Winterbotham, Ed Emshwiller
Date unknown
- Read free
A Toothache on Zenob
Boyd Ellanby, Ed Emshwiller
Date unknown
- Read free
A Transmutation of Muddles
Horace Bowne Fyfe, H. R Van Dongen
Date unknown