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
# Approved For Release 2005/07/20 : CIA-RDP81R00560R000100060001-5 Evaluation JANUARY FEBRUARY MARCH APRIL 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 3 2 5 3.8 2.5 6.3 7 0 7 10.9 0.0 10.9 8 2 10 7.5 1.9 9.4 7 3 10 4.9 2.1 7.0 1-Astromonical 21 18 39 26.2 22.5 48.7 11 15 26 17.2 23.5 40.7 15 12 27 14.0 11.2 25.2 26 3 29 18.3 2.1 20.4 2-Aircraft 6 3 9 7.5 3.8 11.3 7 5 12 10.9 7.8 18.7 12 7 19 11.2 6.5 17.7 23 7 31 16.2 4.9 21.1 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 1 0 1 0.7 0.0 0.7 4-Birds 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 3 0 3 2.8 0.0 2.8 4.1 1 5 2.8 0.7 3.5 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 0 1 1 0.0 0.9 0.9 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 8 0 8 10.0 0.0 10.0 3 0 3 4.7 0.0 4.7 15 0 15 14.0 0.0 14.0 21 0 21 14.8 0.0 14.8 7-Psychological 2 0 2 2.5 0.0 2.5 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 2 0 2 1.4 0.0 1.4 8-Unknown 11 0 11 13.8 0.0 13.8 9 0 9 14.1 0.0 14.1 17 0 17 15.9 0.0 15.9 42 0 42 29.6 0.0 29.6 9-Other 5 1 6 6.2 1.3 7.5 7 0 7 10.9 0.0 10.9 1 14 15 0.9 13.1 14.0 2 0 2 1.4 0.0 1.4 MAY JUNE JULY AUGUST 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 18 5 23 12.0 3.3 15.3 29 6 35 14.4 3.0 17.4 92 48 140 11.9 6.2 18.1 39 42 81 8.7 9.4 18.1 1-Astronomical 23 8 31 15.3 5.3 20.6 25 21 46 12.4 10.4 22.8 104 44 148 13.4 5.7 19.1 47 64 111 10.5 14.3 24.8 2-Aircraft 18 15 33 12.0 10.0 22.0 30 13 43 14.9 6.5 21.4 106 81 187 13.7 10.5 24.2 48 38 86 10.7 8.5 19.2 3-Light Phenom. 3 2 5 2.0 1.3 3.3 1 1 2 0.5 0.5 1.0 14 4 10 1.8 0.5 2.3 7 7 14 1.6 1.6 3.2 4-Birds 0 2 2 0.0 1.3 1.3 0 0 0 0.0 0.0 0.0 3 3 6 0.4 0.4 .8 0 0 0 0.0 0.0 0.0 5-Clouds, Dust, etc. 2 0 2 1.3 0.0 1.3 0 0 0 0.0 0.0 0.0 1 1 2 0.1 0.1 .2 0 1 1 0.0 0.2 0.2 6-Insuffic. Info. 22 0 22 14.7 0.0 14.7 23 0 23 11.4 0.0 11.4 81 0 81 10.5 0.0 10.5 42 0 42 9.4 0.0 9.4 7-Psychological 0 0 0 0.0 0.0 0.0 6 0 6 3.0 0.0 3.0 9 8 17 1.2 1.0 2.2 10 1 11 2.2 0.2 2.4 8-Unknown 23 0 23 15.3 0.0 15.3 38 0 38 18.9 0.0 18.9 146 0 146 18.8 0.0 18.8 87 0 87 19.4 0.0 19.4 9-Other 7 2 9 4.7 1.3 6.0 7 1 8 3.5 0.5 4.0 29 1 30 3.7 0.1 3.8 11 5 16 2.4 1.1 3.5 SEPTEMBER OCTOBER NOVEMBER DECEMBER 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 6 13 19 3.1 6.8 9.9 8 12 20 5.4 8.2 13.6 5 12 17 4.2 10.0 14.2 6 6 12 4.7 4.7 9.4 1-Astronomical 30 11 41 15.6 5.7 21.3 27 19 46 18.4 12.9 51.3 25 19 43 20.8 15.0 35.8 29 23 52 22.8 18.1 40.9 2-Aircraft 13 31 44 6.8 16.1 22.9 10 15 25 6.8 10.2 17.0 11 8 19 9.2 6.7 15.9 8 12 20 6.3 9.4 15.4 3-Light Phenom. 1 2 3 0.5 1.0 1.5 1 4 5 0.7 2.7 3.4 3 1 4 25 0.8 3.3 1 0 1 0.8 0.0 0.8 4-Birds 1 2 3 0.5 1.0 1.5 2 2 4 1.4 1.4 2.8 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 5-Clouds, Dust, etc. 0 1 1 0.0 0.6 0.5 0 1 1 0.0 0.7 0.7 0 2 2 0.0 1.7 1.7 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 20 0 20 10.4 0.0 10.4 10 0 10 6.8 0.0 6.8 7 0 7 5.8 0.0 5.8 9 0 9 7.1 0.0 7.1 7-Psychological 3 0 3 1.6 0.0 1.6 1 0 1 0.7 0.0 0.7 1 0 1 0.8 0.0 0.8 2 0 2 1.6 0.0 1.6 8-Unknown 47 0 47 24.7 0.0 24.7 31 0 31 21.1 0.0 21.1 23 0 23 19.2 0.0 19.2 23 0 23 18.1 0.0 18.1 9-Other 8 3 11 14.2 1.6 5.8 3 1 4 2.0 0.7 2.7 4 0 4 33 0.0 3.3 8 0 8 6.3 0.0 6.3 </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.