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 VIII CHI SQUARE TEST OF REVISED KNOWNS VERSUS UNKNOWNS ON THE BASIS OF COLOR Color Number of KNOWNS Adjusted Number of KNOWNS(K) Number of UNKNOWNS(n) X2(K-n)2/K White 281 95 112 3.04 Metallic 298 101 76 6.19 Not stated 189 64 62 0.06 Orange 117 39 49 2.56 Red 92 31 33 0.13 Yellow 90 30 31 0.03 Green 32 11 14 0.82 Blue 29 10 26 0.57 Other 158 53 31 Total 1286 434 434 13.40 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.