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.
4 i 1 "-- YEAR 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 TOTAL ~. -. §-1 _ - 3 A TOTAL_pF0 szsurzncs, 1947 - 1969 I 4 TOTAL SIGHTINGS" UNIDENTIFIED 122 12 156 7 166 622 210 27 169 22 1,501 303 509 42 497 46 545 '24 670 14 1,006 14 627 10 390 12 557 14 591 '13 474 15 399 14 562 19 887 16 1112 32 937 19 375 3 1 6 1 12,618 701
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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.