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.
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I TABLE V CHI SQUARE TEST OF KNOWNS VERSUS UNKNOWNS
ON THE BASIS OF DURATION OF OBSERVATION
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Adjusted x2
Duration of Number of Number of Number of {K-n} 2
I Observation KNOWNS KNOWNS (K) UNKNOWNS (n) K
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I 5 sec or less 259 64 27 21.39
6-10 sec 92 23 21 o. 17
11-30 sec 153 38 33 0.66
31-60 sec 108 26 42 9.85
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61 sec-5 min 269 66 99 16.50
6-30 min 305 75 71 0.21
Over 30 min 135 33 37 0.48
Not stated 444 109 104 0.23
I Total 1765 434 434 49.49
I Degrees of freedom 7
I 5% 14. 1
1% 18. 5
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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.