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.
# Approved For Release 2005/07/20 : CIA-RDP81R00560R000100060001-5 Evaluation TOTAL NORTH EAST CENTRAL EAST SOUTH EAST 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 241 163 404 8.6 5.8 14.4 9 1 10 17.6 2.0 19.6 52 39 91 8.9 6.7 15.6 1 0 1 3.1 0.0 3.1 1-Astronomical 403 310 713 14.4 11.1 25.5 6 9 15 11.8 17.6 29.4 96 32 118 14.8 5.5 20.3 5 1 6 15.6 3.1 18.7 2-Aircraft 329 256 585 11.8 9.2 21.0 5 6 11 9.8 11.8 21.6 100 65 165 17.2 11.2 28.4 7 4 11 21.9 12.5 34.4 3-Light Phenom. 29 23 52 1.0 0.8 1.8 1 1 2 2.0 2.0 4.0 4 8 12 0.7 1.4 2.1 1 1 2 3.1 3.1 6.2 4-Birds 14 8 20 0.5 0.3 0.8 0 0 0 0.0 0.0 0.0 5 0 5 0.9 0.0 0.9 0 0 0 0.0 0.0 0.0 5-Clouds, Dust, etc. 9 12 21 0.3 0.4 0.7 0 0 0 0.0 0.0 0.0 0 9 9 0.0 1.5 1.5 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 261 0 261 9.3 0.0 9.3 3 0 3 5.9 0.0 5.9 44 0 44 7.6 0.0 7.6 2 0 2 6.3 0.0 6.3 7-Psychological 37 9 46 1.3 0.3 1.6 1 0 1 2.0 0.0 2.0 8 3 11 1.4 0.5 1.9 0 0 0 0.0 0.0 0.0 8-Unknown 582 0 582 20.8 0.0 20.8 9 0 9 17.6 0.0 17.6 112 0 112 19.2 0.0 19.2 4 0 4 12.5 0.0 12.5 9-Other 88 21 109 3.1 0.8 3.9 0 0 0 0.0 0.0 0.0 13 2 15 2.2 0.3 2.5 6 0 6 18.8 0.0 18.8 NORTH MIDWEST CENTRAL MIDWEST SOUTH MIDWEST Evaluation 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 0-Balloon 3 10 13 3.8 12.7 16.5 39 35 74 8.1 7.3 15.4 33 36 69 5.2 5.7 10.9 1-Astronomical 13 6 19 16.5 7.6 24.1 96 36 132 20.0 7.5 27.5 81 10.5 186 12.9 16.7 23.6 2-Aircraft 5 4 9 6.3 5.1 11.4 45 41 86 9.4 8.5 17.9 76 59 135 12.1 9.4 21.5 3-Light Phenom. 0 2 2 0.0 2.5 2.5 11 8 19 2.3 1.7 4.0 5 1 6 0.8 0.2 1.0 4-Birds 1 0 1 1.3 0.0 1.3 3 2 5 0.6 0.4 1.0 4 3 7 0.6 0.5 1.1 5-Clouds, Dust, etc. 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. 10 0 10 12.7 0.0 12.7 62 0 62 12.9 0.0 12.9 56 0 56 8.9 0.0 8.9 7-Psychological 1 0 1 1.3 0.0 1.3 12 0 12 2.5 0.0 2.5 3 3 6 0.5 0.5 1.0 8-Unknown 22 0 22 27.8 0.0 27.8 74 0 74 15.4 0.0 15.4 151 0 151 24.0 0.0 24.0 9-Other 2 0 2 2.5 0.0 2.5 15 2 17 3.1 0.4 3.5 8 5 13 1.3 0.8 2.1 Total 57 22 99 12.2 27.8 100. 35.7 12.4 481. 74.2 25.8 100. 417 212 629. 66.3 33.7 100. NORTH WEST CENTRAL WEST SOUTH WEST Evaluation Number Per Cent Number 1Per Cent Number Per Cent Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total 0-Balloon 4 2 6 8.2 4.1 12.3 5 1 6 5.8 1.2 7.0 38 10 48 9.8 2.6 12.4 1-Astronomical 10 1 11 20.4 2.0 22.4 29 11 40 33.7 12.8 44.5 44 82 126 11.4 21.2 32.6 2-Aircraft 5 1 6 10.2 2.0 12.2 9 4 7 3.5 4.7 8.1 26 32 58 6.7 8.3 15.0 3-Light Phenom. 0 0 0 0.0 0.0 0.0 1 0 1 1.2 0.0 1.2 2 2 4 0.5 0.5 1.0 4-Birds 1 0 1 2.0 0.0 2.0 0 1 1 0.0 1.2 1.2 0 2 2 0.0 0.5 0.5 5-Clouds, Dust, etc. 3 0 3 6.1 0.0 6.1 0 0 0 0.0 0.0 0.0 5 2 7 1.3 0.5 1.8 6-Insuffic. Info. 3 0 3 6.1 0.0 6.1 5 0 5 5.8 0.0 5.8 27 0 27 7.0 0.0 7.0 7-Psychological 2 0 2 4.1 0.0 4.1 6 0 6 9.0 0.0 7.0 0 0 0 0.0 0.0 0.0 8-Unknown 4 0 4 8.2 0.0 8.2 17 0 17 19.8 0.0 19.8 104 0 104 26.9 0.0 26.9 9-Other 13 0 13 26.5 0.0 26.5 3 0 3 3.5 0.0 3.5 4 6 10 1.0 1.6 2.6 Total 45 4 49 91.8 8.2 100. 69 17 86 80.2 19.8 100. 250 136 386 64.8 35.2 100. NORTH FARWEST CENTRAL FARWEST SOUTH FARWEST Evaluation 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 0-Balloon 15 3 18 13.3 2.7 16.0 20 14 34 12.0 8.4 20.4 22 12 34 15.6 8.5 24.1 1-Astronomical 11 10 21 9.7 8.8 18.5 16 6 22 9.6 3.6 13.2 6 11 17 4.3 7.8 12.1 2-Aircraft 13 11 24 11.5 9.7 21.2 26 23 49 15.7 13.9 29.6 18 6 24 12.8 4.3 17.1 3-Light Phenom. 0 0 0 0.0 0.0 0.0 1 0 1 0.6 0.0 0.6 3 0 3 2.1 0.0 2.1 4-Birds 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 5-Clouds, Dust, etc. 1 0 1 0.9 0.0 0.9 0 1 1 0.0 0.6 0.6 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 13 0 13 11.5 0.0 11.5 24 0 24 14.5 0.0 14.5 12 0 12 8.5 0.0 8.5 7-Psychological 0 0 0 0.0 0.0 0.0 1 2 3 0.6 1.2 1.8 3 1 4 2.1 0.7 2.8 8-Unknown 23 0 23 20.4 0.0 20.4 28 0 28 16.7 0.0 16.7 34 0 34 24.1 0.0 24.1 9-Other 13 0 13 11.5 0.0 11.5 2 2 4 1.2 1.2 2.4 9 4 13 6.4 2.8 9.2 Total 69 24 113 18.8 21.2 100. 118 48 166 71.1 28.9 100. 107 34 141 15.9 24.1 100.
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.