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This undated Air Force UFO fact sheet, filed as Attachment 2 in an Office of the Secretary of Defense release, traces UFO investigations from Project Sign in 1948 through Grudge to Project Blue Book. It gives yearly sighting counts from 1947 to 1969: 12,618 reports in all, 701 of them still unexplained. It records that Blue Book was ended on December 17, 1969 and lists its three conclusions: no threat to national security, no technology beyond present knowledge, and no evidence of extraterrestrial vehicles. It also notes that NASA declined to resume investigations in 1977.

Scientific Study of Unidentified Flying Objects. Study conducted
by the University of Colorado under contract F44620-76-C-0035. Three
volumes, 1,465 p. 68 plates. Photoduplicated hard copies of the official
report may be ordered for $6 per volume, $1!-the set of three, as AD
680:975, AD 680:976, and~ 680:977.
Review of University of ~olorado Report on Unidentified
Flying Objects. Review of report by a panel of the National Academy
of Sciences. National Academy of Sciences, 1969, 6p. Photoduplicated
hard copies may be ordered for $3 as AD 688:541.
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Attachment 2, pg 3