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
UFO crash at Roswell
Benson Saler, Charles Charles Albert Ziegler, Charles B Moore
1997
Broken Images Broken Selves: Dissociative Narratives In Clinical Practice
Stanley Krippner, Susan Powers
1997
Otherworlds: Psychedelics and Exceptional Human Experience
David Luke
2017
Beyond top secret
Timothy Good
1996
Gestir utan úr geimnum
Preston Dennett, Helgi Grímsson
2002
UFO
Moreno Tambellini
2022Italian
The ancient visitors
Daniel Cohen
1976
Encyklopedie hrůzy
Joshua Gee
2008Czech
Natural Philosophy of Photons: On the Nature of Electromagnetic Waves and Photonic Information
XIAOMING LI
2026
O livro vermelho dos discos voadores
Flavio Augusto Pereira
1966Portuguese
Platillos voladores sobre Venezuela
Horacio González Ganteaume
1961Spanish
The Lure of the Edge
Brenda Denzler
2001CEB
The matrix
Valdamar Valerian
1992
The world's greatest alien abduction mysteries
2001
UFO - poselství z Atlantidy
J. J Duffack
1994Czech
Antarctica and Siegfried Kracauer’s Extraterrestrial Film Theory
Jennifer Fay
2018
Alien Abductions (The Mysterious & Unknown)
Stuart A. Kallen
2007
Alien abductions
Ray McClellan
2014
Attack of the Fluffy Bunnies
Andrea Beaty
1628
Aurora Rising
Jay Kristoff, Amie Kaufman
2019
CIVILIZATIONS BEYOND EARTH
2011
Choose Your Own Adventure - Alien, Go Home!
Seddon Johnson
1990
Choose Your Own Adventure - Project UFO
R. A. Montgomery
1994
Close Encounters
Carolyn Keene
2006