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 Unwilling Professor
Arthur Porges, Milton Luros
Date unknown
- Read free
The Useless Bugbreeders
James Stamers
Date unknown
- Read free
The Vegans Were Curious
Winston Winston Kinney Marks, W. E Terry
Date unknown
- Read free
The Victory of Klon
Wilbur S Peacock, Don Lynch
Date unknown
- Read free
The War of the Worlds
H. G. Wells
0 CE
- Read free
The Weather on Mercury
Joseph Samachson, Vidmer
Date unknown
- Read free
The Winds of Time
James H Schmitz, Adolph E Brotman
Date unknown
- Read free
The World of Flying Saucers: A Scientific Examination of a Major Myth of the Space Age
Donald Donald Howard Menzel, Lyle Gifford Boyd
Date unknown
- Read free
The green girl
Jack Williamson, Hans Waldemar Wessolowski
Date unknown
- Read free
The guest rites
Robert Silverberg, John Giunta
Date unknown
- Read free
The red brain
Donald Wandrei, Hugh Rankin, Curtis Charles Senf
Date unknown
- Read free
Threlkeld's Daughter
James Bell
Date unknown
- Read free
To Each His Own
Jack Sharkey
Date unknown
- Read free
To Save Earth
Edward W Ludwig, Virgil Finlay, H. R Van Dongen
Date unknown
- Read free
Today is Forever
Roger D Aycock, Ed Emshwiller
Date unknown
- Read free
Trajectory to Taurus
Les Cole, Virgil Finlay
Date unknown
- Read free
USAF Fact Sheet 95-03
United States. Air Force
Date unknown
- Read free
Unwelcomed Visitor
Joseph Samachson
Date unknown
- Read free
Christiani Hugenii Kosmotheoros, sive, De terris coelestibus, earumque ornatu, conjecturae
Christiaan Huygens
1699Latin
- Read free
Christiani Hugenii, sive, De terris coelestibus, earumque ornatu, conjecturae
Christiaan Huygens
1698Latin
- Read free
Das bewohnte Welten-All
Camille Flammarion
1884German
- Read free
Dialogen über die Mehrheit der Welten
Johann Elert Bode, M. de Fontenelle
1780German
- Read free
Entretiens sur la pluralité des mondes. Suivis des Dialogues de morts
M. de Fontenelle
1824French
- Read free
Entretiens sur la pluralité des mondes [I-VI]
M. de Fontenelle, Joseph Jérôme Le Français de Lalande
1820French