Unidentified flying objects

The Flying Saucers are Real

Donald E. (Donald Edward) Keyhoe

USAF Fact Sheet 95-03

Unidentified Flying Objects and Air Force Project Blue Book

United States. Air Force

Federal Bureau of Investigation FOIA Documents - Unidentified Flying Objects

United States. Federal Bureau of Investigation

The Flying Saucers are Real

Donald E. (Donald Edward) Keyhoe

The Report on Unidentified Flying Objects

Edward J. Ruppelt