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Unidentified flying objects — Audiobooks
The Report on Unidentified Flying Objects
by Edward J. Ruppelt
The Flying Saucers are Real
by Donald E. (Donald Edward) Keyhoe
The World of Flying Saucers: A Scientific Examination of a Major Myth of the Space Age
by Donald H. (Donald Howard) Menzel, Lyle Gifford Boyd
Federal Bureau of Investigation FOIA Documents - Unidentified Flying Objects
by United States. Federal Bureau of Investigation
USAF Fact Sheet 95-03
by United States. Air Force