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.
“Midwest”11 pages
# Approved For Release 2005/07/20 : CIA-RDP81R00560R000100060001-5 Evaluation ALL YEARS 1947 1948 1949 Number Per Cent Number Per Cent Number Per Cent 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 20 8 28 8.4 3.3 11.7 3 0 3 20.0 0.0 20.0 1 4 5 5.0 20.0 25.0 2 0 2 10.5 0.0 10.5 1-Astronomical 12 13 25 5.0 5.4 10.4 0 0 0 0.0 0.0 0.0 3 1 4 15.0 5.0 20.0 0 2 2 0.0 10.5 10.5 2-Aircraft 58 26 84 24.3 10.9 35.2 1 0 1 6.7 0.0 6.7 4 1 5 20.0 5.0 25.0 4 2 6 21.1 10.5 31.6 3-Light Phenom. 3 1 4 1.3 0.4 1.7 1 0 1 6.7 0.0 6.7 1 0 1 5.0 0.0 5.0 0 0 0 0.0 0.0 0.0 4-Birds 0 1 1 0.0 0.4 0.4 0 0 0 0.0 0.0 0.0 0 1 1 0.0 5.0 5.0 0 0 0 0.0 0.0 0.0 5-Clouds, Dust, etc. 0 2 2 0.0 0.8 0.8 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. 22 0 22 9.2 0.0 9.2 1 0 1 6.7 0.0 6.7 2 0 2 10.0 0.0 10.0 5 0 5 26.3 0.0 26.3 7-Psychological 6 2 8 2.5 0.8 3.3 1 1 2 6.7 6.7 13.4 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 8-Unknown 58 0 58 24.3 0.0 24.3 6 0 6 40.0 0.0 40.0 2 0 2 10.0 0.0 10.0 4 0 4 21.1 0.0 21.1 9-Other 7 0 7 2.9 0.0 2.9 1 0 1 6.7 0.0 6.7 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 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-Balloon 1 1 2 4.5 4.5 9.0 2 0 2 16.2 0.0 18.2 11 3 14 7.2 2.0 9.2 1-Astronomical 1 √ 3 4.5 9.1 13.6 1 1 2 9.1 9.1 18.2 7 7 14 4.6 4.6 9.2 2-Aircraft 5 0 5 22.7 0.0 23.7 3 1 4 27.3 9.1 86.4 41 22 63 27.0 14.5 41.5 3-Light Phenom. 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 1 1 2 0.7 0.7 1.4 4-Birds 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 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 0 2 2 0.0 1.3 1.3 6-Insuffic. Info. 5 0 5 22.7 0.0 22.7 0 0 0 0.0 0.0 0.0 9 0 9 5.9 0.0 5.9 7-Psychological 1 0 1 4.5 0.0 4.5 0 0 0 0.0 0.0 0.0 4 1 5 2.6 0.1 3.3 8-Unknown 6 0 6 27.3 0.0 27.3 2 0 2 18.2 0.0 18.2 38 0 38 25.0 0.0 25.0 9-Other 0 0 0 0.0 0.0 0.0 1 0 1 9.1 0.0 9.1 5 0 5 3.3 0.0 3.3 ALL YEARS 1947 1948 1949 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-Balloon 18 18 36 3.3 3.3 6.6 1 0 1 3.2 0.0 8.2 1 1 2 3.0 3.0 6.0 0 0 0 0.0 0.0 4.0 1-Astronomical 63 49 112 11.5 8.9 20.4 5 4 9 16.1 12.9 29.0 3 6 9 9.1 18.2 27.3 2 16 18 4.7 37.2 41.9 2-Aircraft 82 75 157 15.0 13.7 28.7 0 2 2 0.0 6.5 6.5 3 1 4 9.1 3.0 12.1 6 5 11 14.0 11.6 25.6 3-Light Phenom. 7 3 10 1.3 0.5 1.8 0 0 0 0.0 0.0 0.0 1 2 3 3.0 6.1 9.1 0 0 0 0.0 0.0 0.0 4-Birds 3 2 5 0.5 0.4 0.9 0 0 0 0.0 0.0 0.0 1 1 2 3.0 3.0 6.0 0 1 1 0.0 2.3 2.3 5-Clouds, Dust, etc. 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 6.0 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 46 0 46 8.4 0.0 8.4 2 0 2 6.5 0.0 6.5 4 0 4 12.1 0.0 12.1 3 0 3 7.0 0.0 7.0 7-Psychological 7 3 10 1.3 0.5 1.8 0 1 1 0.0 3.2 3.2 0 0 0 0.0 0.0 0.0 1 0 1 2.3 0.0 2.3 8-Unknown 145 0 145 26.5 0.0 26.5 13 0 13 41.9 0.0 41.9 7 0 7 21.2 0.0 21.2 8 0 8 18.6 0.0 18.6 9-Other 23 4 27 4.2 0.7 4.9 3 .0 3 9.7 0.0 9.7 1 1 2 3.0 3.0 6.0 1 0 1 2.3 0.0 2.3 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-Balloon 3 0 3 8.6 0.0 8.6 1 0 1 4.2 0.0 4.2 12 17 29 3.1 4.5 7.6 1-Astronomical 1 4 5 2.9 11.4 14.3 7 0 7 29.2 0.0 29.2 45 19 64 11.8 5.0 16.8 2-Aircraft 5 4 9 14.3 11.4 25.7 4 1 5 16.7 4.2 20.9 64 62 126 16.8 16.2 33.0 3-Light Phenom. 0 0 0 0.0 0.0 0.0 1 0 1 4.2 0.0 4.2 5 1 6 1.3 0.3 1.6 4-Birds 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 2 0 2 0.5 0.0 0.5 5-Clouds, Dust, etc. 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. 3 0 3 8.6 0.0 8.6 0 0 0 0.0 0.0 0.0 34 0 34 8.9 0.0 8.9 7-Psychological 0 0 0 0.0 0.0 0.0 0 1 1 0.0 4.2 4.2 6 1 7 1.6 0.3 1.9 8-Unknown 11 0 11 31.4 0.0 31.4 7 0 7 29.2 0.0 29.2 99 0 99 25.9 0.0 25.9 9-Other 2 2 4 5.7 5.7 11.4 2 0 2 8.3 0.0 8.3 14 1 15 3.7 0.3 4.0 </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.