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 ILIST OF ILLUSTRATIONS (Continued) Figure 14 Distribution of Object Sightings by Months Among the Eight Duration Groups for All Years Figure 15 Distribution of Object Sightings by Shape of Object(s) Reported With Evaluation Distribution for Each Shape Group , Figure 16 Distribution of Object Sightings by Reported Speed of Object(s) With Evaluation Distribution for Each Speed Group . Figure 17 Distribution of All Sightings by Observer Location for All Years and Each Year Figure 18 Comparison of Known and Unknown Object Sightings by Color, 1947-1952 Figure 19 Comparison of Known and Unknown Object Sightings by Number of Objects per Sighting, 1947-1952 Figure 20 Comparison of Known and Unknown Object Sightings by Speed, 1947-1952 Figure 21 Comparison of Known and Unknown Object Sightings by Duration, 1947-1952 Figure 22 Comparison of Known and Unknown Object Sightings by Shape, 1947-1952 Figure 23 Comparison of Known and Unknown Object Sightings by Light Brightness, 1947-1952 Figure 24 Comparison of Monthly Distribution of Object Sightings Evaluated as Astronomical Versus Total Object Sightings Less Astronomical. Figure 25 Comparison of Monthly Distribution of Object Sightings Evaluated as Aircraft Versus Total Object Sightings Less Aircraft Figure 26 Comparison of Monthly Distribution of Object Sightings Evaluated as Balloon Versus Total Object Sightings Less Balloon, Figure 27 Comparison of Monthly Distribution of Object Sightings Evaluated as Insufficient Information Versus Total Object Sightings Less Insufficient Information Figure 28 Comparison of Monthly Distribution of Object Sightings Evaluated as Other Versus Total Object Sightings Less Other Figure 29 Comparison of Monthly Distribution of Object Sightings Evaluated as Unknown Versus Total Object Sightings Less Unknown Figure 30 Characteristics Profiles of Object Sightings by Total Sample, Known Evaluations, and Individual Known Evaluations, With Unknown Evaluations Superimposed , Figure 31 Frequency of Object, Unit, and All Sightings Within the U. S., 1947-1952, by Subdivisions of One Degree of Latitude and Longitude Figure 32 Distribution of Object Sightings by Evaluation for the Twelve Regional Areas of the U. S., With the Strategic Areas Located Figure 33 Comparison of Evaluation of Object Sightings in the Strategic Areas of the Central East Region Figure 34 Comparison of Evaluation of Object Sightings in the Strategic Areas of the Central Midwest Region Figure 35 Comparison of Evaluation of Object Sightings in the Strategic Areas of the Central Farwest Region Figure 36 Comparison of Evaluation of Object Sightings in the Strategic Areas of the South Midwest Region . Figure 37 Comparison of Evaluation of Object Sightings in the Strategic Areas of the South West Region iv IPage 30 I 31 I32 33 I34 35 I 36 I37 38 I39 40 I41 42 I 43 I 44 I45 ,- 46 47 I 48 I49 50 I 51 I52 I53 I I 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.