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.
“Gray”4 pages
Evaluation All Years 1947 1948 1949 Number Per Cent Number Per Cent Number Per Cent Number Per Cent Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total 0-Balloon 38 40 78 4.8 5.1 9.9 1 0 1 3.2 0.0 3.2 3 3 6 9.4 9.4 18.8 0 0 0 0.0 0.0 0.0 1-Astromonical 131 63 194 16.7 8.0 24.7 13 1 14 41.9 3.2 451 2 4 6 6.3 12.5 18.8 32 26 58 34.0 21.7 61.7 2-Aircraft 75 58 133 9.6 7.4 17.0 1 1 2 3.2 3.2 6.4 4 0 4 12.5 0.0 12.5 7 8 15 7.4 8.5 15.9 3-Light Phenom. 9 0 9 1.1 0.0 1.1 0 0 0 0.0 0.0 0.0 2 0 2 6.3 0.0 6.3 0 0 0 0.0 0.0 0.0 4-Birds 6 1 7 0.8 0.1 0.9 0 0 0 0.0 0.0 0.0 0 1 1 0.0 31 31 0 0 0 0.0 0.0 0.0 5-Clouds, Dust, etc. 5 0 5 0.6 0.0 0.6 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 109 0 109 13.9 0.0 13.9 4 0 4 12.9 0.0 12.9 7 0 7 21.9 0.0 21.9 8 0 8 8.5 0.0 8.5 7-Psychological 2 2 4 0.3 0.3 0.6 1 0 1 3.2 0.0 3.2 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 8-Unknown 191 0 191 24.4 0.0 24.4 6 0 6 19.4 0.0 19.4 6 0 6 18.8 0.0 18.8 6 0 6 6.4 0.0 6.4 9-Other 43 11 54 5.5 1.4 6.9 3 0 3 9.7 0.0 9.7 0 0 0 0.0 0.0 0.0 7 0 7 7.4 0.0 7.4 1950 1951 1952 Evaluation Number Per Cent Number Per Cent Number Per Cent Number Per Cent Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total 0-Bailoon 4 2 6 4.7 2.4 7.1 0 2 2 0.0 3.6 3.6 30 33 63 6.2 6.8 13.0 1-Astronomical 19 4 23 22.3 4.7 27.0 12 6 18 21.8 10.9 32.7 53 22 75 10.9 4.5 15.4 2-Aircraft 11 8 19 12.9 9.4 22.3 2 2 4 3.6 3.6 7.2 50 39 89 10.3 8.0 18.3 3-Light Phenom. 0 0 0 0.0 0.0 0.0 2 0 2 3.6 0.0 3.6 5 0 5 1.0 0.0 1.0 4-Birds 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 6 0 6 1.2 0.0 1.2 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 5 0 5 1.0 0.0 1.0 6-Insuffic. Info. 9 0 9 10.6 0.0 10.6 4 0 4 9.3 0.0 7.3 77 0 77 15.8 0.0 15.8 7-Psychological 0 0 0 0.0 0.0 0.0 1 0 1 1.8 0.0 1.8 0 2 2 0.0 0.4 0.4 8-Unknown 23 0 23 27.1 0.0 27.1 19 0 19 34.5 0.0 34.5 131 0 131 26.9 0.0 26.9 9-Other 3 2 5 3.5 2.4 5.9 5 0 5 9.1 0.0 9.1 25 9 34 5.1 1.8 6.9 </td
FOIA release, from the cia-readingroom collection. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 312 pages are in the text index: search them above, or from the library's search.