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.
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# Approved For Release 2005/07/20 : CIA-RDP81R00560R000100060001-5 Evaluation SUNLIGHT ON MIRROR SUNLIGHT ON ALUMINUM SUNLIGHT ON PLASTER SUNLIGHT ON STONE 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 3 5 3.3 4.9 8.2 27 17 44 15.1 9.5 24.6 11 7 18 15.7 10.0 25.7 2 1 3 12.5 6.2 18.7 1-Astronomical 12 11 23 19.7 18.0 37.7 7 8 15 3.9 4.5 8.4 9 2 11 12.9 2.9 15.8 0 1 1 0.0 6.2 6.2 2-Aircraft 7 2 9 11.5 3.3 14.8 32 27 59 17.9 15.1 33.0 6 10 16 8.6 14.3 22.9 0 3 3 0.0 18.8 18.8 3-Light Phenom. 1 0 1 1.6 0.0 1.6 0 3 3 0.0 1.7 1.7 0 1 1 0.0 1.4 1.9 0 0 0 0.0 0.0 0.0 4-Birds 0 0 0 0.0 0.0 0.0 1 1 2 0.6 0.6 1.2 0 1 1 0.0 1.4 1.9 0 1 1 0.0 6.2 6.2 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 1 0 1 0.6 0.0 0.6 0 2 2 0.0 2.9 2.9 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 3 0 3 4.9 0.0 4.9 15 0 15 8.4 0.0 8.4 9 0 9 12.9 0.0 12.9 1 0 1 6.2 0.0 6.2 7-Psychological 2 1 3 3.3 1.6 4.9 2 2 4 1.1 1.1 3.2 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 8-Unknown 14 0 14 28.0 0.0 23.0 28 0 28 15.6 0.0 15.6 11 0 11 15.7 0.0 15.7 5 0 5 31.2 0.0 31.2 9-Other 1 2 3 1.6 3.3 4.9 6 2 8 3.4 1.1 4.5 1 0 1 1.4 0.0 1.4 2 0 2 12.5 0.0 12.5 SUNLIGHT ON SOIL BRIGHTER THAN MOON LIKE MOON DULLER THAN MOON 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 0 4 66.7 0.0 66.7 14 21 35 4.2 6.3 10.5 1 0 1 2.9 0.0 2.9 5 3 8 10.2 6.1 16.3 1-Astronomical 0 1 1 0.0 16.7 16.7 82 48 130 24.6 14.4 39.0 3 8 11 8.9 23.5 32.3 6 8 14 12.2 16.3 28.5 2-Aircraft 0 0 0 0.0 0.0 0.0 20 41 61 6.0 12.3 18.3 5 2 7 14.7 5.9 20.7 3 3 6 6.1 6.1 12.2 3-Light Phenom. 0 0 0 0.0 0.0 0.0 6 3 9 1.8 0.9 2.7 1 2 3 2.9 5.9 8.8 1 1 2 2.0 2.0 4.0 4-Birds 0 0 0 0.0 0.0 0.0 1 0 1 0.3 0.0 0.3 0 0 0 0.0 0.0 0.0 0 1 1 0.0 2.0 2.0 5-Clouds, Dust, etc. 0 1 1 0.0 16.7 16.7 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 20 0 20 6.0 0.0 6.0 0 0 0 0.0 0.0 0.0 3 0 3 6.1 0.0 6.1 7-Psychological 0 0 0 0.0 0.0 0.0 2 0 2 6.6 0.0 0.6 0 1 1 0.0 2.9 2.9 0 2 2 0.0 4.1 4.1 8-Unknown 0 0 0 0.0 0.0 0.0 61 0 61 18.3 0.0 18.3 11 0 11 32.4 0.0 32.4 10 0 10 20.4 0.0 20.4 9-Other 0 0 0 0.0 0.0 0.0 9 6 15 2.7 1.8 4.5 0 0 0 0.0 0.0 0.0 0 3 3 1.0 6.1 6.1 BARELYVISIBLE 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 1 1 2 14.3 14.3 28.6 140 79 219 9.7 5.5 15.2 1-Astronomical 1 0 1 14.3 0.0 14.3 154 118 272 10.7 8.2 18.9 2-Aircraft 1 1 2 14.3 14.3 28.6 191 120 311 13.2 8.3 31.5 3-Light Phenom. 0 0 0 0.0 0.0 0.0 21 8 29 1.5 0.6 2.1 4-Birds 0 0 0 0.0 0.0 0.0 10 6 16 0.9 0.4 1.1 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 2 4 6 0.1 0.3 0.4 6-Insuffic. Info. 1 0 1 14.3 0.0 14.3 188 0 188 13.0 0.0 13.0 7-Psychological 0 0 0 0.0 0.0 0.0 29 3 32 2.0 0.2 2.2 8-Unknown 1 0 1 14.3 0.0 14.3 293 0 293 20.3 0.0 20.3 9-Other 0 0 0 0.0 0.0 0.0 88 11 77 4.6 0.8 5.4 </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.