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.
Read from the scan by GLM-OCR; expect the odd misread word.
Evaluation 5 SECONDS AND LESS 6-10 SECONDS 11-30 SECONDS 31-60 SECONDS 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 1 0 1 5.0 0.0 5.0 0 0 0 0.0 0.0 0.0 0 1 1 0.0 0.2 6.2 1 0 1 11.1 0.0 11.1 1-Astronomical 10 5 15 50.0 25.0 75.0 1 2 3 16.7 33.3 50.0 6 1 7 37.5 6.2 43.7 0 2 2 0.0 22.2 22.2 2-Aircraft 1 0 1 5.0 0.0 5.0 3 0 3 50.0 0.0 50.0 4 2 6 25.0 12.5 37.5 2 0 2 22.2 0.0 22.2 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 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 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 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 2 0 2 10.0 0.0 10.0 0 0 0 0.0 0.0 0.0 1 0 1 6.2 0.0 6.2 0 0 0 0.0 0.0 0.0 7-Psychological 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 8-Unknown 1 0 1 5.0 0.0 5.0 0 0 0 0.0 0.0 0.0 1 0 1 6.2 0.0 6.2 3 0 3 33.3 0.0 33.3 9-Other 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 1 0 1 11.1 0.0 11.1 61 SECONDS-5 MINUTES 6-30 MINUTES OVER 30 MINUTES NOT STATED 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 4 1 5 11.1 28 13.9 9 2 11 23.1 5.1 28.2 3 0 3 27.3 0.0 27.3 4 1 5 5.6 1.4 7.0 1-Astronomical 4 0 4 11.1 0.0 11.1 2 0 2 5.1 0.0 5.1 2 1 3 18.2 9.1 27.3 17 7 24 23.6 9.7 33.3 2-Aircraft 4 1 5 11.1 2.8 13.9 3 3 6 7.7 7.7 15.4 0 2 2 0.0 18.2 18.2 13 3 16 18.1 4.2 22.3 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 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 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 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 3 0 3 8.3 0.0 8.3 3 0 3 7.7 0.0 7.7 1 0 1 9.1 0.0 9.1 16 0 16 22.2 0.0 22.2 7-Psychological 1 0 1 2.8 0.0 2.8 1 0 1 2.6 0.0 2.6 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 8-Unknown 13 0 13 36.1 0.0 36.1 13 0 13 33.3 0.0 33.3 2 0 2 18.2 0.0 19.2 9 0 9 12.5 0.0 12.5 9-Other 2 3 5 5.6 8.3 13.9 1 2 3 2.6 5.1 7.7 0 0 0 0.0 0.0 0.0 2 0 2 2.9 0.0 2.8 5 SECONDS AND LESS 6-10 SECONDS 11-30 SECONDS 31-60 SECONDS 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 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 1-Astronomical 8 2 10 53.3 13.3 66.6 3 0 3 50.0 0.0 50.0 3 0 3 37.5 0.0 37.5 0 1 1 0.0 20.0 20.0 2-Aircraft 1 0 1 6.7 0.0 6.7 1 0 1 16.7 0.0 16.7 3 0 3 37.5 0.0 37.5 3 1 4 60.0 20.0 80.0 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 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 12.5 12.5 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 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 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 7-Psychological 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 8-Unknown 4 0 4 26.7 0.0 26.7 2 0 2 33.3 0.0 33.3 1 0 1 12.5 0.0 12.5 0 0 0 0.0 0.0 0.0 9-Other 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 61SECONDS-5MINUTES 6-30MINUTES OVER30MINUTES NOTSTATED 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 2 1 3 8.7 4.3 13.0 2 0 2 8.7 0.0 8.7 1 0 1 12.5 0.0 12.5 4 2 6 8.2 4.1 12.3 1-Astronomical 0 1 1 0.0 4.3 4.3 3 1 4 13.0 4.3 17.6 1 1 2 12.5 12.5 25.0 3 8 11 6.1 16.3 22.4 2-Aircraft 3 1 4 13.0 4.3 17.3 2 4 6 8.7 17.4 26.1 1 0 1 12.5 0.0 12.5 2 2 4 4.1 4.1 8.2 3-Light Phenom. 0 1 1 0.0 4.3 4.3 1 0 1 4.3 0.0 4.3 0 0 0 0.0 0.0 0.0 1 0 1 2.0 0.0 2.0 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 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 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 1 0 1 4.3 0.0 4.3 1 0 1 4.3 0.0 4.3 2 0 2 25.0 0.0 25.0 10 0 10 20.4 0.0 20.4 7-Psychological 0 1 1 0.0 4.3 4.3 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 1 0 1 2.0 0.0 2.0 8-Unknown 10 0 10 43.5 0.0 43.5 6 0 6 26.1 0.0 26.1 2 0 2 25.0 0.0 25.0 13 0 13 26.5 0.0 26.5 9-Other 2 0 2 8.7 0.0 8.7 3 0 3 13.0 0.0 13.0 0 0 0 0.0 0.0 0.0 3 0 3 6.1 0.0 6.1 </td
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.