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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ITABLE IV CHI SQUARE TEST OF KNOWNS VERSUS
UNKNOWNS ON THE BASIS OF SHAPE
IAdjusted x2
' INumber of Number of Number of {K-n} 2
Shape KNOWNS KNOWNS {K) UNKNOWNS (n) K
Elliptical 838 206 195 0.59 IRocket and aircraft 80 20 33 8.45
Meteor or comet 55 14 4 7. 14 ITeardrop, lenticular, 103 25 22 0.36
or conical
Flame 96 24 10 8. 17 IOther 193 47 54 1.04
Not stated 400 98 116 3.30
ITotal 1765 434 434 29.05
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Degrees of freedom 6
I5% 12.6
1% 16.8
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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.