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 NEW YORK HARRISBURG WASHINGTON BALANCE OF CENTRAL EAST 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 8 7 15 7.6 6.7 14.3 7 6 13 11.5 9.8 21.3 15 8 23 10.3 5.5 15.8 8 6 14 9.9 7.4 17.3 1-Astronomical 11 6 17 10.5 5.7 16.2 10 6 16 16.3 9.8 26.2 15 7 22 10.3 4.8 15.1 10 5 15 12.3 6.2 18.5 2-Aircraft 24 8 32 22.9 7.6 30.5 9 9 18 14.8 14.8 29.6 20 2.4 4.4 13.7 16.4 30.1 9 9 18 11.1 11.1 22.2 3-Light Phenom. 1 1 2 1.0 1.0 2.0 1 0 1 1.6 0.0 1.6 0 2 2 0.0 1.4 1.4 1 3 4 1.2 3.7 4.9 4-Birds 0 0 0 0.0 0.0 0.0 2 0 2 3.3 0.0 3.3 1 0 1 0.7 0.0 0.7 0 0 0 0.0 0.0 0.0 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 0 2 2 0.0 1.4 1.4 0 1 1 0.0 1.2 1.2 6-Insuffic. info. 17 0 17 16.2 0.0 16.2 1 0 1 1.6 0.0 1.6 10 0 10 6.8 0.0 6.8 10 0 10 12.3 0.0 12.3 7-Psychological 6 0 6 5.7 0.0 5.7 1 0 1 1.6 0.0 1.6 0 0 0 0.0 0.0 0.0 0 2 2 0.0 2.5 2.5 8-Unknown 11 0 11 10.5 0.0 10.5 7 0 7 11.5 0.0 11.5 39 0 39 26.7 0.0 26.7 12 0 12 14.8 0.0 14.8 9-Other 5 0 5 4.8 0.0 4.8 2 0 2 3.3 0.0 3.3 3 0 3 2.1 0.0 2.1 3 2 5 3.7 2.5 6.2 Evaluation CHICAGO DAYTON BALANCE OF CENTRAL MIDWEST 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 0-Balloon 2 5 7 3.0 7.6 10.6 15 8 23 10.4 5.6 16.0 13 15 28 7.9 9.1 17.0 1-Astronomical 5 6 11 7.6 9.1 16.7 21 11 32 14.6 7.6 22.2 27 7 34 16.5 4.3 20.8 2-Aircraft 10 8 18 15.2 12.1 27.3 19 18 37 13.2 12.5 25.7 13 9 22 7.9 5.5 13.4 3-Light Phenom. 0 1 1 0.0 1.5 1.5 6 2 8 4.2 1.4 5.6 5 2 7 3.0 1.2 4.2 4-Birds 1 0 1 1.5 0.0 1.5 1 0 1 0.7 0.0 0.7 1 2 3 0.6 1.2 1.8 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 15.2 0.0 15.2 20 0 20 13.9 0.0 13.9 27 0 27 16.5 0.0 16.5 7-Psychological 5 0 5 7.6 0.0 7.6 2 0 2 1.4 0.0 1.4 5 0 5 3.0 0.0 3.0 8-Unknown 9 0 9 13.6 0.0 13.6 14 0 14 9.7 0.0 9.7 34 0 34 20.7 0.0 20.7 9-Other 4 0 4 6.1 0.0 6.1 6 1 7 4.2 0.7 4.9 4 0 4 2.4 0.0 2.4 TABLE A237 EVALUATION OF OBJECT SIGHTINGS IN THE STRATEGIC AREAS SAN FRANCISCO BALANCE OF CENTRAL FARWEST 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 14 7 21 15.1 7.5 22.6 2 2 4 5.3 5.3 10.6 1-Astronomical 8 3 11 8.6 3.2 11.8 3 3 6 7.9 7.9 15.8 2-Aircraft 15 7 22 16.1 7.5 23.6 9 5 14 23.7 13.2 36.9 3-Light Phenom. 0 0 0 0.0 0.0 0.0 1 0 1 2.6 0.0 2.6 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 2.6 2.6 6-Insuffic. Info. 15 0 15 16.1 0.0 16.1 7 0 7 18.4 0.0 18.4 7-Psychological 1 2 3 1.1 2.2 3.3 0 0 0 0.0 0.0 0.0 8-Unknown 18 0 18 19.4 0.0 19.4 4 0 4 10.5 0.0 10.5 9-Other 1 2 3 1.1 2.2 3.3 1 0 1 2.6 0.0 2.6 </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.