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.
“Jet Propulsion Laboratory”1 page
# Approved For Release 2005/07/20 : CIA-RDP81R00560R000100060001-5 TABLE A4 EVALUATION OF ALL SIGHTINGS 84 MONTH OF YEAR ALL YEARS JANUARY FEBRUARY MARCH APRIL Evaluation 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 3 3 6 2.2 2.2 4.4 9 0 9 9.7 0.0 9.7 16 4 20 9.6 2.4 12.0 7 3 10 3.5 1.5 5.0 1-Astronomical 29 46 75 21.3 33.8 55.1 17 16 33 18.3 17.2 35.5 21 20 41 12.7 12.0 24.7 52 9 61 26.0 4.5 30.5 2-Aircraft 6 3 9 4.4 2.2 6.6 9 5 14 9.7 5.4 15.1 23 7 30 13.9 4.2 18.1 28 8 36 14.0 4.0 18.0 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 1 0 1 0.5 0.0 0.5 4-Birds 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 5 0 5 3.0 0.0 3.0 4 1 5 2.0 0.5 2.5 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 0.6 0.6 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 8 0 8 5.9 0.0 5.9 13 0 13 14.0 0.0 14.0 22 0 22 13.3 0.0 13.3 26 0 26 13.0 0.0 13.0 7-Psychological 2 0 2 1.5 0.0 1.5 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 2 0 2 1.0 0.0 1.0 8-Unknown 26 0 26 19.5 0.0 19.5 16 0 16 17.2 0.0 17.2 29 0 29 17.5 0.0 17.5 57 0 57 28.5 0.0 28.5 9-Other 9 1 10 6.6 0.7 7.3 8 0 8 8.6 0.0 8.6 1 17 18 0.6 10.2 10.8 2 0 2 1.0 0.0 1.0 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 24 5 29 12.4 2.6 15.0 36 6 42 15.8 2.6 18.4 100 55 155 10.8 5.9 16.7 39 44 83 7.5 8.4 15.9 1-Astronomical 28 10 38 14.4 5.2 19.6 29 23 52 12.7 10.1 22.8 116 55 171 12.5 5.9 18.4 53 70 123 10.2 13.4 23.6 2-Aircraft 25 15 40 12.9 7.7 20.6 30 13 43 13.2 5.7 18.9 133 9.8 231 14.3 10.5 24.8 52 55 107 10.0 10.6 20.6 3-Light Phenom. 3 3 6 1.5 1.5 3.0 1 3 4 0.4 1.3 1.7 14 4 18 1.5 0.4 1.9 7 7 14 1.3 1.3 2.6 4-Birds 0 2 2 0.0 1.0 1.0 0 0 0 0.0 0.0 0.0 4 3 7 0.4 0.3 0.7 0 0 0 0.0 0.0 0.0 5-Clouds, Dust, etc. 8 0 8 4.1 0.0 4.1 0 0 0 0.0 0.0 0.0 4 1 5 0.4 0.1 0.5 0 1 1 0.0 0.2 0.2 6-Insuffic. Info. 22 0 22 11.3 0.0 11.3 25 0 25 11.0 0.0 11.0 98 0 88 9.5 0.0 9.5 45 0 45 8.6 0.0 8.6 7-Psychological 0 0 0 0.0 0.0 0.0 6 0 6 2.6 0.0 2.6 9 9 18 1.0 1.0 2.0 10 1 11 1.9 0.2 2.1 8-Unknown 36 0 36 18.6 0.0 18.6 47 0 47 20.6 0.0 20.6 195 0 195 21.0 0.0 21.0 119 0 119 22.8 0.0 22.8 9-Other 9 4 13 4.6 2.1 6.7 8 1 9 3.5 0.4 3.9 40 1 41 4.3 0.1 4.4 11 7 18 2.1 1.3 3.4 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 14 20 2.9 6.7 9.6 16 21 37 8.3 10.9 19.2 5 18 23 3.0 11.0 14.0 9 7 16 5.4 4.2 9.6 1-Astronomical 31 11 42 14.8 5.2 20.0 40 21 61 20.8 10.9 31.7 28 29 57 17.1 17.7 34.0 32 31 63 19.0 18.5 27.5 2-Aircraft 14 37 51 6.7 17.6 24.3 11 17 28 5.7 8.9 14.6 11 16 27 6.7 9.8 16.5 12 14 26 7.1 8.3 15.4 3-Light Phenom. 1 2 3 0.5 1.0 1.5 1 4 5 0.5 2.1 2.6 3 1 4 1.8 0.6 2.4 1 0 1 0.6 0.0 0.6 4-Birds 1 2 3 0.5 1.0 1.5 5 2 7 2.6 1.0 3.6 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 0.5 0.5 0 1 1 0.0 0.5 0.5 0 8 8 0.0 4.9 4.9 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 20 0 20 9.5 0.0 9.5 12 0 12 6.2 0.0 6.2 8 0 8 4.9 0.0 4.9 9 0 9 5.4 0.0 5.4 7-Psychological 3 0 3 1.4 0.0 1.4 1 0 1 0.5 0.0 0.5 1 0 1 0.6 0.0 0.6 4 0 4 2.4 0.0 2.4 8-Unknown 56 0 56 26.7 0.0 26.7 36 0 36 18.7 0.0 18.7 32 0 32 19.5 0.0 19.5 40 0 40 23.8 0.0 23.8 9-Other 8 3 11 3.8 1.4 5.2 3 1 4 1.6 0.5 2.1 4 0 4 2.4 0.0 2.4 9 0 9 5.4 0.0 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.