Sci-Fi
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3 editions- Hardcover · EnglishBarnes Noble Books · 9780760701966
- Other · English · 1974UFO's--a scientific debate.Norton · 310 pages · 9780393007398
- Other · English · 1972Cornell University Press · 310 pages · 9780801407406
Unidentified flying objectsCongressesSpace FlightUfo's