Documents / FOIA release
This CIA-released copy of Project Blue Book Special Report No. 14 is dated 5 May 1955 and comes from the Air Technical Intelligence Center at Wright-Patterson Air Force Base. It is a statistical analysis of about 4,000 unidentified aerial object reports from 1947 through 1952, coded onto IBM punched cards with the help of a panel of scientists. The report concludes that such objects were highly unlikely to be technological developments beyond present-day scientific knowledge. It also found no valid evidence of physical matter.
“Harder”1 page
Read from the scan by GLM-OCR; expect the odd misread word.
TABLE XII CHI SQUARE TEST OF REVISED KNOWNS VERSUS UNKNOWNS ON THE BASIS OF SPEED Speed Number of KNOWNS Adjusted Number of KNOWNS(K) Number of UNKNOWNS(n) X2(K-n)2/K Stationary 196 66 53 2.56 Less than 100mph 128 43 26 6.72 100 to 400mph 156 53 58 0.47 Over 400mph 291 98 145 28.54 Meteor-like 24 8 16 Not stated 491 166 136 5.42 Total 1286 434 434 43.71 Degrees of freedom 4 5% 9.5 1% 13.3
FOIA release, from the cia-readingroom collection. The PDF is mirrored here; the original link is above. The text was read from the page images by GLM-OCR; expect the odd misread word. 312 pages are in the text index: search them above, or from the library's search.