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.
“Jet Propulsion Laboratory”1 page
Read from the scan by GLM-OCR; expect the odd misread word.
TABLE XI CHI SQUARE TEST OF REVISED KNOWNS VERSUS UNKNOWNS ON THE BASIS OF DURATION OF OBSERVATION Duration of Observation Number of KNOWNS Adjusted Number of KNOWNS(K) Number of UNKNOWNS(n) X2,(K-n)2/K 5 sec or less 92 31 27 0.52 6-10 sec 47 16 21 1.56 11-30 sec 118 40 33 1.23 31-60 sec 92 31 42 3.90 61 sec-5 min 252 85 99 2.31 6 min-30 min 259 87 71 2.94 Over 30 min 91 31 37 1.16 Not stated 335 113 104 0.72 Total 1286 434 434 14.34 Degrees of freedom 7 5% 14.1 1% 18.5
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.