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.
## Approved For Release 2005/07/20 : CIA-RDP81R00560R000100060001-5 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 5 6 0.4 2.0 2.4 3 4 7 2.7 3.6 6.3 5 9 14 2.7 4.9 7.6 8 11 19 5.7 7.9 13.6 1-Astronomical 9.0 38 132 38.4 15.5 53.9 29 15 44 25.9 13.4 39.3 26 9 35 14.1 4.9 19.0 10 5 15 7.1 3.6 10.7 2-Aircraft 24 24 48 9.8 9.8 19.6 19 13 32 17.0 11.6 28.6 35 33 68 18.9 17.8 36.7 24 20 44 17.1 14.3 31.4 3-Light Phenom. 1 2 3 0.4 0.8 1.2 1 0 1 0.9 0.0 0.9 1 1 2 0.5 0.5 1.0 0 2 2 0.0 1.4 1.4 4-Birds 1 3 4 0.4 1.2 1.6 0 1 1 0.0 0.9 0.9 1 0 1 0.5 0.0 0.5 3 1 4 2.1 0.7 2.8 5-Clouds, Dust, etc. 1 1 2 0.4 0.4 0.8 0 0 0 0.0 0.0 0.0 0 2 2 0.0 1.1 1.1 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 11 0 11 4.5 0.0 4.5 7 0 7 6.2 0.0 6.2 11 0 11 5.9 0.0 5.9 11 0 11 7.9 0.0 7.9 7-Psychological 2 0 2 0.8 0.0 0.8 0 0 0 0.0 0.0 0.0 5 2 7 2.7 1.1 3.8 2 0 2 1.4 0.0 1.4 8-Unknown 2.6 0 26 10.6 0.0 10.6 19 0 19 17.0 0.0 17.0 33 0 33 17.8 0.0 17.8 40 0 40 28.6 0.0 28.6 9-Other 9 2 11 3.7 0.8 4.5 1 0 1 0.9 0.0 0.9 4 8 12 2.2 4.3 6.5 1 2 3 0.7 1.4 2.1 61 SECONDS-5MINUTES 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 46 36 82 12.7 9.9 22.6 62 45 107 16.8 12.2 29.0 27 12 39 14.4 6.4 20.8 35 22 57 8.4 5.3 13.7 1-Astronomical 4 9 12 1.1 2.2 3.3 23 15 38 6.2 4.1 10.3 27 14 41 14.4 7.5 21.9 47 16 63 11.3 3.8 15.1 2-Aircraft 57 56 113 15.7 15.4 31.1 32 41 73 8.6 11.1 19.7 11 9 20 5.9 4.8 10.7 48 36 84 11.5 8.7 20.2 3-Light Phenom. 6 3 9 1.7 0.8 2.5 19 6 19 3.5 1.6 5.1 1 2 3 0.5 1.1 1.6 3 1 4 0.7 0.2 0.9 4-Birds 1 0 1 0.3 0.0 0.3 0 0 0 0.0 0.0 0.0 3 0 3 1.6 0.0 1.6 4 0 4 1.0 0.0 1.0 5-Clouds, Dust, etc. 1 7 8 0.3 1.9 2.2 3 2 5 0.8 0.5 1.3 4 0 4 2.1 0.0 2.1 3 1 4 0.7 0.2 0.9 6-Insuffic. Info. 18 0 18 5.0 0.0 5.0 29 0 29 7.8 0.0 7.8 8 0 8 4.3 0.0 4.3 71 0 71 17.1 0.0 17.1 7-Psychological 11 3 7 1.1 0.8 1.9 7 0 7 1.9 0.0 1.9 4 1 5 2.1 0.5 2.6 2 1 3 0.5 0.2 0.7 8-Unknown 101 0 101 27.8 0.0 27.8 77 0 77 20.8 0.0 20.8 53 0 53 28.3 0.0 28.3 106 0 106 25.5 0.0 25.5 9-Other 12 0 12 3.3 0.0 3.3 11 4 15 3.0 1.1 4.1 8 3 11 4.3 1.6 5.9 19 1 20 4.6 0.2 4.8 </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.