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
I I I I I I I I I TABLE XI CHI SQUARE TEST OF REVISED KNOWNS VERSUS UNKNOWNS ON THE BASIS OF DURATION OF OBSERVATION Adjusted x2, Duration of Number of Number of Number of (K-n} 2 Observation KNOWNS KNOWNS (K) UNKNOWNS ( n) K I 5 sec or less 92 31 27 0.52 6-10 sec 47 16 21 1. 56 I 11-30 sec 31-60 sec 118 92 40 31 33 42 1. 23 3.90 I 61 sec-5 min 6 min-30 min 252 259 85 87 99 71 2. 31 2.94 Over 30 min 91 31 37 1. 16 I Not stated 335 113 104 0.72 Total 1286 434 434 14.34 I I Degrees of freedom 5% 7 14. 1 I 1% 18.5 I I I I I 73 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.