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.
“Gray”4 pages
Evaluation SUNLIGHT ON MIRROR SUNLIGHT ON ALUMINUM SUNLIGHT ON PLASTER SUNLIGHT ON STONE 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 2 5 7 2.4 5.9 8.3 31 23 54 12.7 9.4 22.1 11 8 19 12.2 8.9 21.1 2 2 4 10.5 10.5 21.0 1-Astronomical 19 14 33 22.4 16.5 38.9 12 10 22 4.9 4.1 9.0 9 9 18 10.0 10.0 20.0 2 1 3 10.5 5.3 15.8 2-Aircraft 9 3 12 10.6 3.5 14.1 42 34 76 17.2 13.9 31.1 6 13 19 6.7 14.4 21.1 0 3 3 0.0 15.8 15.8 3-Light Phenom. 1 0 1 1.2 0.0 1.2 0 4 4 0.0 1.6 1.6 0 1 1 0.0 1.1 1.1 0 0 0 0.0 0.0 0.0 4-Birds 0 0 0 0.0 0.0 0.0 1 1 2 0.4 0.4 0.8 1 1 2 1.1 1.1 2.2 0 1 1 0.0 5.3 5.3 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 2 0 2 0.8 0.0 0.8 1 2 3 1.1 2.2 3.3 0 0 0 0.0 0.0 0.0 6-Insuffice. Info. 9 0 9 10.6 0.0 10.6 17 0 17 7.0 0.0 7.0 9 0 9 10.0 0.0 10.0 1 0 1 5.3 0.0 5.3 7-Psychological 2 2 4 2.4 2.4 4.9 2 2 4 0.8 0.8 1.6 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 8-Unknown 15 0 15 17.6 0.0 17.6 52 0 52 21.3 0.0 24.3 16 0 16 17.8 0.0 17.8 5 0 5 26.3 0.0 26.3 9-Other 1 3 4 1.2 3.5 4.7 9 2 11 3.7 0.8 4.5 3 0 3 3.3 0.0 3.3 2 0 2 10.5 0.0 10.5 SUNLIGHT ON SOIL BRIGHTER THAN MOON LIKE MOON DULLER THAN MOON 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 4 0 4 57.1 0.0 57.1 19 28 47 4.0 5.9 9.9 1 2 3 1.9 3.8 5.7 5 7 12 7.1 10.0 17.1 1-Astronomical 0 1 1 0.0 14.3 14.3 130 69 199 27.5 14.6 42.1 4 11 15 7.5 20.8 28.3 6 17 23 8.6 24.3 32.9 2-Aircraft 0 0 0 0.0 0.0 0.0 27 52 79 5.7 11.0 16.7 14 2 16 2.64 3.8 30.2 3 3 6 4.3 4.3 8.6 3-Light Phenom. 0 0 0 0.0 0.0 0.0 6 3 9 1.3 0.6 1.9 1 2 3 1.9 3.8 5.7 1 3 4 1.4 4.3 5.7 4-Birds 0 0 0 0.0 0.0 0.0 1 0 1 0.2 0.0 0.2 0 0 0 0.0 0.0 0.0 1 1 2 1.4 1.4 2.8 5-Clouds, Dust, etc. 0 1 1 0.0 14.3 14.3 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. 0 0 0 0.0 0.0 0.0 22 0 22 4.7 0.0 4.7 0 0 0 0.0 0.0 0.0 3 0 3 4.3 0.0 4.3 7-Psychological 0 0 0 0.0 0.0 0.0 3 0 3 0.6 0.0 0.6 0 1 1 0.0 1.9 1.9 0 2 2 0.0 2.9 2.9 8-Unknown 1 0 1 14.3 0.0 14.3 92 0 92 19.5 0.0 19.5 15 0 15 28.3 0.0 28.3 15 0 15 24.4 0.0 24.4 9-Other 0 0 0 0.0 0.0 0.0 14 6 20 3.0 1.3 4.3 0 0 0 0.0 0.0 0.0 0 3 3 0.0 4.3 4.3 BARELY VISIBLE NOT STATED Evaluation 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 1 1 2 8.3 8.3 16.6 194 104 298 9.0 4.8 13.8 1-Astronomical 2 0 2 16.7 0.0 16.7 292 209 501 13.6 9.7 23.3 2-Aircraft 1 1 2 8.3 8.3 16.6 252 177 429 11.7 8.2 19.9 3-Light Phenom. 0 0 0 0.0 0.0 0.0 23 11 34 1.1 0.5 1.6 4-Birds 0 0 0 0.0 0.0 0.0 15 6 21 0.7 0.3 1.0 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 9 10 19 0.4 0.5 0.9 6-Insuffic. Info. 2 0 2 16.7 0.0 16.7 235 0 235 10.9 0.0 10.9 7-Psychological 0 0 0 0.0 0.0 0.0 31 3 34 1.4 0.1 1.5 8-Unknown 4 0 4 33.3 0.0 33.3 474 0 474 22.1 0.0 22.1 9-Other 0 0 0 0.0 0.0 0.0 83 21 104 3.9 1.0 4.9 </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.