Documents / FOIA release
This FBI file gathers correspondence about Project Blue Book. In a January 1977 letter, the Department of the Air Force sent the FBI a UFO Fact Sheet. It says Blue Book ended on December 17, 1969, and found no evidence that UFOs posed a threat, used technology beyond known science or were extraterrestrial, and it lists 12,618 sightings, 701 of them unidentified. The file also contains 1989 letters from the civilian group calling itself 'the new Project Blue Book' to Director William Sessions, plus his reply that UFO investigation was never FBI responsibility.
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FOIA release, from the fbi-vault collection. The PDF is mirrored here; the original link is above. 13 pages are in the text index: search them above, or from the library's search.