Documents / Case file
This CIA archives copy, released in 2026, holds Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects). The Air Technical Intelligence Center at Wright-Patterson Air Force Base issued it on 5 May 1955. The study reduced about 4,000 sighting reports from 1947 to 1952 to IBM punched cards, with 3,201 cases charted, and applied chi square tests to compare known and unknown sightings. It concludes that it is highly improbable the reports represent technological developments beyond present-day scientific knowledge.
From the source:Release of 2026-06-12 This is the USAF Project Blue Book with a CIA cover sheet stating the document is "Official Record Copy." With the exception of the handwritten note on the first page, the content of this document has been available on CIA's public website.
“The Unexplained Files”1 page
30 20 10 0 10 20 30 I I I I I I I I I I I I Unknown IAll yearsI I 1947 II 1948 I 1949 I 1950 I 195 I I 1952 I Other Astronomical IAll years I 1947 I I I1948 I I1949 I I1950 I 1951 I I I195 2 I. Aircraft IAll years I I1947 I I1948 I I1949 I I1950 I I195 I I I195 2 I Balloons All years I I 1947 I 1948 I I 1949 I I 1950 I I 195 I I I 195 2 I I lnsuf. info. I All years I 1947 I 1948 I 1949 I 1950 I 195 I I 195 2 All years I1947 1948 I1949 1950 195 I 1952 I 30 20 10 0 10 20 30 ICertain Per Cent Doubtful FfGURE 6 DISTRIBUTION OF OBJECT SIGHTINGS BY CERTAIN AND I I I DOUBTFUL EVALUATIONS FOR ALL YEARS AND EACH YEAR A•7414 22
Case file, from the pursue collection. The PDF is mirrored here; the original link is above. 312 pages are in the text index: search them above, or from the library's search.