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 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 184 121 305 9.6 6.3 15.9 7 1 8 18.9 2.7 21.6 38 27 6.5 9.7 6.9 16.6 1 0 1 4.5 0.0 4.5 1-Astronomical 237 182 419 12.4 9.5 21.9 4 3 7 10.8 8.1 18.9 46 24 7.0 11.7 6.1 17.8 4 1 5 18.2 4.5 22.7 2-Aircraft 245 188 433 12.8 9.8 22.6 3 5 8 8.1 13.5 21.6 62 50 112 15.8 12.7 28.5 5 1 6 22.7 4.5 27.2 3-Light Phenom. 27 17 44 1.4 0.9 2.3 1 1 2 2.7 2.7 5.4 3 6 9 0.8 1.5 2.3 1 1 2 4.5 4.5 9.0 4-Birds 10 8 18 0.5 0.4 0.9 0 0 0 0.0 0.0 0.0 3 0 3 0.8 0.0 0.8 0 0 0 0.0 0.0 0.0 5-Clouds, Dust, etc. 2 6 8 0.1 0.3 0.4 0 0 0 0.0 0.0 0.0 0 3 3 0.0 0.8 0.8 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 205 0 205 10.7 0.0 10.7 3 0 3 8.1 0.0 8.1 38 0 38 9.7 0.0 9.7 2 0 2 9.1 0.0 9.1 7-Psychological 34 8 42 1.8 0.4 2.2 1 0 1 2.7 0.0 2.7 7 2 9 1.8 0.5 2.3 0 0 0 0.0 0.0 0.0 8-Unknown 359 0 359 18.7 0.0 18.7 8 0 8 21.6 0.0 21.6 6.9 0 69 17.6 0.0 17.6 4 0 4 18.2 0.0 18.2 9-Other 67 16 83 3.5 0.8 4.5 0 0 0 0.0 0.0 0.0 13 2 15 3.3 0.5 3.8 2 0 2 9.1 0.0 9.1 NORTH MIOWEST CENTRAL MIOWEST SOUTH MIOWEST 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 7 10 4.8 11.3 16.1 30 28 58 8.0 7.5 15.5 25 28 53 6.4 7.2 13.6 1-Astronomical 8 3 11 12.9 4.8 17.7 53 24 77 14.2 6.4 20.6 51 59 110 13.0 15.1 26.1 2-Aircraft 5 4 9 8.1 6.5 14.6 42 35 77 11.2 9.4 20.6 50 41 91 12.8 10.5 23.3 3-Light Phenom. 0 2 2 0.0 3.2 3.2 11 5 16 2.9 1.3 4.2 4 0 4 1.0 0.0 1.0 4-Birds 1 0 1 1.6 0.0 1.6 3 2 5 0.8 0.5 1.3 3 3 6 0.8 0.8 1.6 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. 8 0 8 12.9 0.0 12.9 57 0 57 15.2 0.0 15.2 35 0 35 9.0 0.0 9.0 7-Psychological 1 0 1 1.6 0.0 1.6 12 0 12 3.2 0.0 3.2 3 3 6 0.8 0.8 1.6 8-Unknown 18 0 18 29.0 0.0 29.0 57 0 57 15.2 0.0 15.2 74 0 74 18.9 0.0 18.9 9-Other 2 0 2 3.2 0.0 3.2 14 1 15 37 0.3 4.0 8 4 12 2.0 1.0 3.0 Total 46 16 62 74.2 25.8 100. 279 95 374 74.6 25.4 100. 253 138 391 64.7 35.3 100. Evaluation NORTH WEST CENTRAL WEST SOUTH WEST 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 2 5 11.5 7.7 19.2 3 1 4 5.1 1.7 6.8 28 5 33 12.6 2.2 14.8 1-Astronomical 3 1 4 11.5 3.8 15.3 11 9 20 18.6 15.3 33.9 31 34 65 13.9 15.2 23.1 2-Aircraft 5 1 6 19.2 43.8 23.0 3 3 6 5.1 5.1 10.2 21 21 42 9.4 9.4 18.8 3-Light Phenom. 0 0 0 0.0 0.0 0.0 1 0 1 1.7 0.0 1.7 2 2 4 0.9 0.9 1.8 4-Birds 0 0 0 0.0 0.0 0.0 0 1 1 0.0 1.7 1.7 0 2 2 0.0 0.9 0.9 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 1 2 3 2.4 0.9 1.3 6-Insuffic. Info. 3 0 3 11.5 0.0 11.5 5 0 5 8.5 0.0 8.5 14 0 14 6.3 0.0 6.3 7-Psychological 2 0 2 7.7 0.0 7.7 4 0 4 6.8 0.0 6.8 0 0 0 0.0 0.0 0.0 8-Unknown 3 0 3 11.5 0.0 11.5 15 0 15 25.4 0.0 25.4 53 0 53 23.5 3.0 23.8 9-Other 3 0 3 11.5 0.0 11.5 3 0 3 5.1 0.0 5.1 4 3 7 1.8 1.3 3.1 Total 22 4 26 84.6 15.4 100. 45 14 59 76.3 23.7 100. 154 69 223 69.1 30.9 100. 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 13 3 16 13.6 3.2 14.8 16 9 25 12.2 6.9 19.1 17 10 27 6.5 9.7 26.2 1-Astronomical 10 8 18 10.5 8.4 18.9 11 6 17 8.4 4.6 13.0 5 10 15 4.9 9.7 14.6 2-Aircraft 12 9 21 12.6 9.5 22.1 24 12 36 18.3 9.2 27.5 13 6 9 12.6 5.8 18.4 3-Light Phenom. 0 0 0 0.0 0.0 0.0 1 0 1 0.8 0.0 0.8 3 0 3 2.9 0.0 2.9 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 1.1 0.0 1.1 0 1 1 0.0 0.8 0.8 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 10 0 10 10.5 0.0 10.5 22 0 22 14.8 0.0 16.8 8 0 5 7.8 0.0 7.5 7-Psychological 0 0 0 0.0 0.0 0.0 1 2 3 0.8 1.5 2.3 3 1 4 2.9 0.0 3.9 8-Unknown 21 0 21 22.1 0.0 22.1 22 0 22 14.8 0.0 16.8 15 0 15 14.6 0.0 14.6 9-Other 8 0 8 8.4 0.0 8.4 2 2 4 1.5 1.5 3.0 8 4 12 7.8 3.9 11.7 Total 75 20 95 18.9 21.1 100 9.9 3.2 131 15.6 24.4 100. 72 31 103 69.9 30.1 100.
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.