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 XIII CHI SQUARE TEST OF REVISED KNOWNS VERSUS UNKNOWNS ON THE BASIS OF LIGHT BRIGHTNESS Light Brightness Number of KNOWNS Adjusted Number of KNOWNS(K) Number of UNKNOWNS(n) X2(K-n)2/K Sunlight on mirror 24 8 14 2.67 Sunlight on aluminum 136 46 28 Sunlight on plaster, stone, or soil 63 21 16 1.19 Brighter than moon 143 48 61 3.52 Like moon or duller than moon 42 15 22 3.27 Not stated 878 296 293 0.03 Total 1286 434 434 10.68 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.