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
Era