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
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 Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total 0-Balloon 1 5 6 0.5 2.9 3.2 2 3 5 2.5 3.7 6.2 4 6 10 2.9 4.3 7.2 8 9 17 7.0 7.8 14.8 1-Astronomical 64 28 92 34.8 15.2 50.0 18 12 30 22.2 14.8 37.0 17 7 24 12.1 5.6 17.1 7 3 10 6.1 2.6 8.7 2-Aircraft 18 20 38 9.8 10.9 20.7 16 8 24 19.8 9.9 29.7 28 28 56 20.0 20.0 40.0 21 17 38 18.3 14.8 33.1 3-Light Phenom. 1 2 3 .5 1.1 1.6 1 0 1 1.2 0.0 1.2 1 1 2 .7 .7 1.4 0 2 2 0.0 1.7 1.7 4-Birds 1 3 4 .5 1.6 2.1 0 1 1 0.0 1.2 1.2 1 0 1 .7 0.0 .7 2 1 3 1.7 .9 2.6 5-Clouds, Dust, etc. 0 1 1 0.0 5 0.5 0 0 0 0.0 0.0 0.0 0 2 2 0.0 1.4 1.4 0 0 0 0.0 0.0 0.0 6-insuffic. Info. 9 0 9 4.9 0.0 4.9 6 0 6 7.4 0.0 7.4 10 0 10 7.1 0.0 7.1 9 0 9 7.8 0.0 7.8 7-Psychological 2 0 2 1.1 0.0 1.1 0 0 0 0.0 0.0 0.0 4 1 5 2.9 0.7 3.6 2 0 2 1.7 0.0 1.7 8-Unknown 19 0 19 10.3 0.0 10.3 13 0 13 16.0 0.0 16.0 22 0 22 15.7 0.0 15.7 31 0 31 27.0 0.0 27.0 9-Other 8 2 10 4.3 1.1 5.4 1 0 1 1.2 0.0 1.2 4 4 8 2.9 2.9 58 1 2 3 0.9 1.7 2.6 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 38 32 70 13.7 11.6 25.3 50 30 80 17.7 10.6 28.3 21 12 33 15.0 8.6 23.6 24 16 40 8.5 5.7 14.2 1-Astronomical 2 6 8 0.7 2.2 2.9 19 14 33 6.7 4.9 11.6 20 13 33 14.3 9.3 23.6 24 8 32 8.5 2.8 11.3 2-Aircraft 40 45 85 14.4 16.2 30.6 29 27 56 10.2 9.5 19.7 7 7 14 50 5.0 10.0 39 29 58 12.1 8.5 20.6 3-Light Phenom. 5 2 7 1.8 0.7 2.5 13 5 18 4.6 1.8 6.4 1 2 3 0.7 1.4 2.1 3 0 3 1.1 0.0 1.1 4-Birds 1 0 1 0.4 0.0 0.4 0 0 0 0.0 0.0 0.0 2 0 2 1.4 0.0 1.4 1 0 1 0.4 0.0 0.4 5-Clouds, Dust, etc. 0 3 3 0.0 1.1 1.1 1 1 2 0.4 0.4 0.8 1 0 1 0.7 0.0 0.7 1 0 1 0.4 0.0 0.4 6-Insuffic. Info. 17 0 17 6.1 0.0 6.1 24 0 24 8.5 0.0 8.5 6 0 6 4.3 0.0 4.3 67 0 67 23.8 0.0 23.8 7-Psychological 4 3 7 1.4 1.1 2.5 7 0 7 2.5 0.0 2.5 9 1 5 2.9 0.7 3.6 2 1 3 0.7 0.4 1.1 8-Unknown 71 0 71 25.6 0.0 25.6 51 0 51 18.0 0.0 18.0 33 0 33 23.6 0.0 23.6 63 0 63 22.4 1.0 22.4 9-Other 8 0 8 2.9 0.0 2.9 10 2 12 3.5 0.7 4.2 7 3 10 5.0 2.1 7.1 12 1 13 4.3 0.4 4.7 </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.