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
I I I LIST OF ILLUSTRATIONS (Continued) Figure 38 Comparison of Evaluation of Object Sightings in the Strategic Areas of the I South Farwest Region . 54 I Figure 39 Diagram of a Celestial Sphere. 56 Figure 40 Frequency of Object Sightings by Angle of Elevation of the Sun, Intervals of 10 Degrees of Angle. 57 I Figure 41 Frequency of Object Sightings by Local Sun Time, Intervals of One Hour 59 Table Object Sightings 60 I Table II Chi Square Test of Knowns Versus Unknowns on the Basis of Color 62 Table III Chi Square Test of Knowns Versus Unknowns on the Basis of Number 63 I Table IV Chi Square Test of Knowns Versus Unknowns on the Basis of Shape 64 Table V Chi Square Test of Knowns Versus Unknowns on the Basis of Duration of Observation 65 I Table VI Chi Square Test of Knowns Versus Unknowns on the Basis of Speed ti6 Table VII Chi Square Test of Knowns Versus Unknowns on the Basis of Light Brightness 67 I Table VIII Chi Square Test of Revised Knowns Versus Unknowns on the Basis of Color 70 Table IX Chi Square Test of Revised Knowns Versus Unknowns on the Basis of Number. 71 I Table X Chi Square Test of Revised Knowns Versus Unknowns on the Basis of Shape 72 Table XI Chi Square Test of Revised Knowns Versus Unknowns on the Basis of Duration of Ob~ervation 73 I Table XII Chi Square Test of Revised Knowns Versus Unknowns on the Basis of Speed 74 Table XIII Chi Square Test of Revised Knowns Versus Unknowns on the Basis of Light Brightness. 75 I I I I I I I I I v and vi 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.