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 NORTH AMERICA UNITED STATES CANADA ALASKA 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 251 169 420 8.4 5.7 14.1 241 16.3 404 8.6 5.8 14.4 3 4 7 3.7 4.9 8.6 2 1 3 4.3 2.1 6.4 1-Astronomical 443 329 772 14.9 11.1 26.0 403 31.0 713 14.4 11.1 25.5 23 6 31 28.4 9.9 38.3 12 0 12 25.5 0.0 25.5 2-Aircraft 343 260 603 11.6 8.8 30.4 329 256 585 11.8 9.2 21.0 10 1 11 12.3 1.2 13.5 3 0 3 6.4 0.0 6.4 3-Light Phenom. 31 23 54 1.0 0.8 1.8 29 23 52 1.0 0.8 1.8 0 0 0 0.0 0.0 0.0 1 0 1 2.1 0.0 2.1 4-Birds 14 9 23 0.5 0.3 0.8 14 8 22 0.5 0.3 0.8 0 1 1 0.0 1.2 1.2 0 0 0 0.0 0.0 0.0 5-Clouds, Dust, etc. 9 13 22 0.3 0.4 0.7 9 12 21 0.3 0.4 0.7 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 271 0 271 9.1 0.0 9.1 261 0 261 9.3 0.0 9.3 4 0 4 4.9 0.0 4.9 2 0 2 4.3 0.0 4.3 7-Psychological 38 9 47 1.3 0.3 1.6 37 9 46 1.3 0.3 1.6 1 0 1 1.2 0.0 1.2 0 0 0 0.0 0.0 0.0 8-Unknown 638 0 638 21.5 0.0 21.5 582 0 582 20.8 0.0 20.8 22 0 22 27.2 0.0 27.2 22 0 22 46.8 0.0 46.8 9-Other 97 22 119 3.3 0.7 4.0 88 21 109 3.1 0.8 3.9 3 1 4 3.7 1.2 4.9 4 0 4 8.5 0.0 8.5 MEXICO HAWAII 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 2 0 2 13.3 0.0 13.3 3 1 4 9.7 3.2 12.9 1-Astronomical 1 2 3 6.7 13.3 20.0 4 9 13 12.9 29.0 41.9 2-Aircraft 0 1 1 0.0 6.7 6.7 1 2 3 3.2 6.5 9.7 3-Light Phenom. 1 0 1 6.7 0.0 6.7 0 0 0 0.0 0.0 0.0 4-Birds 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 0 1 1 0.0 3.2 3.2 6-Insuffic. Info. 2 0 2 13.3 0.0 13.3 2 0 2 6.5 0.0 6.5 7-Psychological 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 8-Unknown 6 0 6 40.0 0.0 40.0 6 0 6 19.4 0.0 19.4 9-Other 0 0 0 0.0 0.0 0.0 2 0 2 6.5 0.0 6.5 NORTH AMERICA UNITED STATES CANADA ALASKA 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 214 143 357 9.0 6.0 15.0 205 137 342 92 6.1 15.3 3 4 7 5.0 6.7 11.7 2 1 3 5.9 2.9 8.8 1-Astronomical 359 246 605 15.1 10.4 25.5 328 228 556 14.7 10.2 24.9 17 7 24 28.3 11.7 40.0 9 0 9 26.5 0.0 26.5 2-Aircraft 281 213 494 11.9 9.0 20.8 272 210 482 12.2 9.4 21.7 5 0 5 8.3 0.0 8.3 3 0 3 8.8 0.0 8.8 3-Light Phenom. 31 20 51 1.3 0.8 2.2 29 20 49 1.3 0.9 2.2 0 0 0 0.0 0.0 0.0 1 0 1 2.9 0.0 2.9 4-Birds 11 9 20 0.5 0.4 0.8 11 8 19 0.5 0.4 0.9 0 1 1 0.0 1.7 1.7 0 0 0 0.0 0.0 0.0 5-Clouds, Dust, etc. 2 7 9 0.1 0.3 0.4 2 6 8 0.1 0.3 0.4 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 6-Insuffic. Info. 236 0 236 10.0 0.0 10.0 226 0 226 10.1 0.0 10.1 4 0 4 6.7 0.0 6.7 2 0 2 5.9 0.0 5.9 7-Psychological 36 8 44 1.5 0.3 1.8 35 8 43 1.6 0.4 2.0 1 0 1 1.7 0.0 1.7 0 0 0 0.0 0.0 0.0 8-Unknown 455 0 455 19.2 0.0 19.2 418 0 418 18.7 0.0 18.7 15 0 15 25.0 0.0 25.0 13 0 13 38.2 0.0 38.2 9-Other 79 20 99 33 0.8 41 72 19 91 3.2 0.9 41 2 1 3 3.3 1.7 5.0 3 0 3 8.8 0.0 8.8 MEXICO HAWAII 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 0 1 8.3 0.0 8.3 3 1 4 10.0 2.3 13.3 1-Astronomical 1 2 3 8.3 16.7 25.0 4 9 13 13.3 30.0 43.3 2-Aircraft 0 1 1 0.0 8.3 8.3 1 2 3 3.3 6.7 10.0 3-Light Phenom. 1 0 1 8.3 0.0 8.3 0 0 0 0.0 0.0 0.0 4-Birds 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 0 1 1 0.0 3.3 3.3 6-Insuffic. Info. 2 0 2 16.7 0.0 16.7 2 0 2 6.7 0.0 6.7 7-Psychological 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 8-Unknown 4 0 4 33.3 0.0 33.3 5 0 5 16.7 0.0 16.7 9-Other 0 0 0 0.0 0.0 0.0 2 0 2 6.7 0.0 6.7 </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.