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
TABLE AS EVALUATION OF OBJECT SIGHTINGS BY YEARS ALL YEARS 1947 1948 1949 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 207 132 339 9.4 6.0 15.4 7 0 7 8.9 0.0 8.9 12 10 22 8.4 9.0 15.4 11 2 13 5.9 1.1 7.0 1-Astronomical 274 205 479 12.5 9.3 21.8 8 8 16 10.1 10.1 20.2 25 23 48 17.5 16.1 336 29 55 84 15.6 29.5 45.1 2-Aircraft 265 209 474 12.0 9.5 21.5 2 2 4 2.5 2.5 5.0 15 4 19 10.5 2.8 133 18 12 30 9.7 6.4 16.1 3-Light Phenom. 30 18 48 1.4 0.8 2.2 2 0 2 2.5 0.0 2.5 2 3 5 1.4 2.1 3.5 0 0 0 0.0 0.0 0.0 4-Birds 12 10 22 0.5 0.5 1.0 0 0 0 0.0 0.0 0.0 2 3 5 1.4 2.1 3.5 2 1 3 1.1 0.5 1.6 5-Clouds, Dust, etc. 3 7 10 0.1 0.3 0.4 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. 240 0 240 10.9 0.0 10.9 12 0 12 15.2 0.0 15.2 17 0 17 11.9 0.0 11.9 25 0 25 13.4 0.0 13.4 7-Psychological 35 9 44 1.6 0.4 2.0 3 2 5 3.8 2.5 6.3 1 0 1 0.7 0.0 0.7 3 0 3 1.6 0.0 1.6 8-Unknown 434 0 434 19.7 0.0 19.7 22 0 22 27.8 0.0 27.8 15 0 15 10.5 0.0 10.5 22 0 22 11.8 0.0 11.8 9-Other 85 24 109 3.9 11 5.0 11 0 11 13.9 0.0 13.9 4 7 11 2.8 4.9 7.7 6 0 6 3.2 0.0 3.2 1950 1951 1952 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 21 4 25 12.4 2.4 14.8 8 3 11 6.6 2.5 9.1 148 113 261 9.9 7.5 17.4 1-Astronomical 25 14 39 14.8 8.3 23.1 16 14 30 13.2 11.6 24.8 171 91 262 11.4 6.1 17.5 2-Aircraft 22 9 31 13.0 5.3 18.3 15 6 21 12.4 5.0 17.4 193 176 369 12.9 11.7 24.6 3-Light Phenom. 0 0 0 0.0 0.0 0.0 1 1 2 0.8 0.8 1.6 25 14 39 1.7 0.9 2.6 4-Birds 0 0 0 0.0 0.0 0.0 0 1 1 0.0 0.8 0.8 8 5 13 0.5 0.3 0.8 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 3 7 10 0.2 0.5 0.7 6-Insuffic. Info. 24 0 24 14.2 0.0 14.2 14 0 14 11.6 0.0 11.6 148 0 148 9.9 0.0 9.9 7-Psychological 2 0 2 1.2 0.0 1.2 1 1 2 0.8 0.8 1.6 25 6 31 1.7 0.4 2.1 8-Unknown 39 0 39 23.0 0.0 23.0 33 0 33 27.3 0.0 27.3 303 0 303 20.2 0.0 20.2 9-Other 6 3 9 3.5 1.8 5.3 7 0 7 5.8 0.0 5.8 51 14 65 3.4 0.9 4.3 </td
FOIA release, from the cia-readingroom collection. The PDF is mirrored here; the original link is above. 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.