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 TABLE A163 EVALUATION OF OBJECT SIGHTINGS FOR ALL YEARS BY REPORTED 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 0 2 2 0.0 2.0 2.0 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 1-Astronomical 35 24 59 35.4 24.2 59.6 6 5 11 46.2 38.5 84.7 0 2 2 0.0 100.0 2-Aircraft 6 2 8 6.1 2.0 8.1 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 3-Light Phenom. 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 4-Birds 0 1 1 2.0 1.0 1.0 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 5-Clouds, Dust, etc. 1 0 1 1.0 0.0 1.0 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 6-Insuffic. Info. 8 0 8 8.1 0.0 8.1 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 7-Psychological 0 1 1 0.0 1.0 1.0 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 8-Unknown 16 0 16 16.2 0.0 16.2 2 0 2 15.4 0.0 15.4 0 0 0 0.0 0.0 9-Other 3 0 3 3.0 0.0 3.0 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 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 0 2 2 0.0 3.0 3.0 1-Astronomical 5 4 9 55.6 44.4 100.0 1 3 4 12.5 37.5 50.0 23 10 33 34.3 14.9 49.2 2-Aircraft 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 6 2 8 9.0 3.0 12.0 3-Light Phenom. 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 4-Birds 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 0 1 1 0.0 1.5 1.5 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 1 0 1 1.5 0.0 1.5 6-Insuffic. Info. 0 0 0 0.0 0.0 0.0 1 0 1 12.5 0.0 12.5 7 0 7 10.4 0.0 10.9 7-Psychological 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 0 1 1 0.0 1.5 1.5 8-Unknown 0 0 0 0.0 0.0 0.0 2 0 2 25.0 0.0 25.0 12 0 12 17.9 0.0 17.9 9-Other 0 0 0 0.0 0.0 0.0 1 0 1 12.5 0.0 12.5 2 0 2 3.0 0.0 3.0 TABLE A104 EVALUATION OF OBJECT SIGHTINGS FOR ALL YEARS BY REPORTED 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 63 40 103 7.6 4.8 12.4 2 0 2 6.9 0.0 6.9 2 3 5 3.9 5.9 9.8 7 0 7 7.6 0.0 7.6 1-Astronomical 115 89 204 13.8 10.7 24.5 3 2 5 10.3 6.9 17.2 7 10 17 13.7 19.6 33.3 17 31 48 18.5 33.7 52.2 2-Aircraft 83 75 158 10.0 9.0 19.0 1 0 1 3.4 0.0 3.4 7 1 8 13.7 2.0 15.7 7 2 9 7.6 2.2 9.8 3-Light Phenom. 16 9 25 1.9 1.1 3.0 1 0 1 3.4 0.0 3.4 0 1 1 0.0 2.0 2.0 0 0 0 0.0 0.0 0.0 4-Birds 6 5 11 0.7 0.6 1.3 0 0 0 0.0 0.0 0.0 1 1 2 2.0 2.0 4.0 2 0 2 2.2 0.0 2.2 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 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 134 0 134 16.1 0.0 161 9 0 9 31.0 0.0 31.0 9 0 9 17.6 0.0 17.6 14 0 14 15.2 0.0 15.2 7-Psychological 12 2 14 1.4 0.2 1.6 2 0 2 6.9 0.0 6.9 1 0 1 2.0 0.0 2.0 1 0 1 1.1 0.0 1.1 8-Unknown 136 0 136 16.4 0.0 164 3 0 3 10.3 0.0 10.3 3 0 3 5.9 0.0 5.9 7 0 7 7.6 0.0 7.6 9-Other 34 12 46 4.1 1.4 5.5 6 0 6 20.7 0.0 20.7 2 3 5 3.9 5.9 9.8 4 0 4 4.3 0.0 4.3 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 8 2 10 11.4 2.9 14.3 1 3 4 1.6 4.8 6.4 43 32 75 8.2 6.1 14.3 1-Astronomical 12 4 16 17.1 5.7 22.8 5 8 13 7.9 12.7 20.6 71 34 105 13.5 6.5 20.0 2-Aircraft 9 5 14 12.9 7.1 20.0 6 4 10 9.5 6.3 15.8 53 63 116 10.1 12.0 22.1 3-Light Phenom. 0 0 0 0.0 0.0 0.0 0 1 1 0.0 1.6 1.6 15 7 22 2.9 1.3 4.2 4-Birds 0 0 0 0.0 0.0 0.0 0 1 1 0.0 1.6 1.6 3 3 6 0.6 0.6 1.2 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. 13 0 13 18.6 0.0 18.6 12 0 12 19.0 0.0 19.0 77 0 77 14.6 0.0 14.6 7-Psychological 0 0 0 0.0 0.0 0.0 1 0 1 1.6 0.0 1.6 7 2 9 1.3 0.4 1.7 8-Unknown 14 0 14 20.0 0.0 20.0 18 0 18 28.6 0.0 28.6 91 0 91 17.3 0.0 17.3 9-Other 3 0 3 4.3 0.0 4.3 3 0 3 4.8 0.0 4.8 16 9 25 3.0 1.7 4.7 </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.