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 X CHI SQUARE TEST OF REVISED KNOWNS VERSUS UNKNOWNS ON THE BASIS OF SHAPE Shape Number of KNOWNS Adjusted Number of KNOWNS(K) Number of UNKNOWNS(n) X2,(K-n)2K Elliptical 632 213 195 1.52 Rocket or aircraft 72 24 33 3.37 Meteor or comet 9 3 4 1.32 Flame 47 16 10 0.93 Teardrop, lenticular, or conical 79 27 22 0.93 Other 151 51 54 1.76 Not stated 296 100 116 2.56 Total 1286 434 434 11.46 Degrees of freedom 5 5% 11.1 1% 15.1
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.