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.
“Harder”1 page
TABLE II CHI SQUARE TEST OF KNOWNS VERSUS UNKNOWNS ON THE BASIS OF COLOR I I I I I I I Adjusted x2 Number of Number of Number of (K-n)2 IColor KNOWNS KNOWNS (K) UNKNOWNS (n) K IWhite 405 100 112 1. 44 Metallic 313 77 76 0. 01 Not stated 209 51 62 2.37 IOrange 172 42 49 1. 17 Red 146 36 33 0.25 Yellow 128 31 31 0 IGreen 130 32 14 10. 13 Blue 67 17 26 4. 76 IOther 195 48 31 6.02 Total 1765 434 434 26. 15 I Degrees of freedom 8 I 15.5 I20. 1 I I I I I I62 I
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.