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.
Read from the scan by GLM-OCR; expect the odd misread word.
# Approved For Release 2005/07/20 : CIA-RDP81R00560R000100060001-5 TABLE A1 EVALUATION OF ALL 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 270 180 450 8.4 5.6 14.0 7 0 7 6.0 0.0 6.0 17 20 37 8.3 9.5 18.1 16 5 21 4.1 1.2 5.3 1-Astronomical 476 341 817 14.9 10.6 25.5 52 8 40 27.4 6.6 34.2 36 39 45 17.5 19.0 36.5 74 132 206 18.7 33.5 52.2 2-Aircraft 354 288 642 11.1 9.0 20.1 2 2 4 19 1.7 3.4 16 5 21 7.8 2.4 10.2 31 26 57 7.8 6.4 4.4 3-Light Phenom. 32 24 56 1.0 0.8 1.8 2 0 2 1.7 0.0 1.7 2 6 8 10 2.9 3.9 0 0 0 00 0.0 0.0 4-Birds 19 10 29 0.6 0.3 0.9 0 0 0 0.0 0.0 0.0 2 3 5 10 1.5 2.5 4 1 5 1.1 0.2 1.3 5-Clouds, Dust, etc. 12 13 25 0.4 0.4 7.8 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. 298 0 298 9.3 0.0 9.3 14 0 14 12.0 0.0 12.0 19 0 19 9.3 0.0 9.3 36 0 36 9.1 0.0 9.1 7-Psychological 38 10 48 1.2 0.3 1.5 3 2 5 2.6 1.7 4.3 1 0 1 0.5 0.0 0.5 3 0 3 0.7 0.0 6.7 8-Unknown 689 0 689 21.5 0.0 21.5 28 0 28 23.9 0.0 23.9 27 0 27 13.2 0.1 13.2 56 0 56 14.2 0.0 14.2 9-Other 112 35 147 3.5 1.1 4.6 17 0 17 14.5 0.0 14.5 4 8 12 1.0 3.9 5.8 11 0 11 2.8 0.0 2.8 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 33 7 40 10.8 2.3 13.1 10 4 14 6.2 2.5 8.1 187 144 331 9.3 7.1 16.4 1-Astronomical 49 25 74 16.0 8.2 24.2 25 17 42 15.6 10.6 26.2 260 120 380 12.9 6.0 18.9 2-Aircraft 39 15 54 12.7 4.9 17.6 16 8 24 10.0 5.0 15.0 250 232 482 12.4 11.5 23.9 3-Light Phenom. 0 0 0 0.0 0.0 0.0 2 1 3 1.3 0.7 2.0 26 17 43 1.3 0.8 2.1 4-Birds 0 0 0 0.0 0.0 0.0 0 1 1 0.0 0.7 0.7 13 5 18 0.6 0.2 0.8 5-Clouds, Dust, etc. 0 0 0 0.0 0.0 0.0 0 0 0 0.0 0.0 0.0 12 13 25 0.6 0.6 1.2 6-Insuffic. Info. 49 0 49 16.0 0.0 16.0 14 0 14 8.7 0.0 8.7 166 0 166 8.2 0.0 8.2 7-Psychological 4 0 4 1.3 0.0 1.3 1 1 2 0.7 0.7 1.4 26 7 33 1.3 0.3 1.6 8-Unknown 71 0 71 23.2 0.0 23.2 52 0 52 32.5 0.0 32.5 455 0 455 22.6 0.0 22.6 9-Other 7 7 14 2.3 2.3 4.6 8 0 8 5.0 0.0 5.0 65 20 85 3.2 1.0 4.2 TABLE A2 EVALUATION OF UNIT 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 228 151 379 8.9 5.9 14.8 7 0 9 7.2 0.0 7.2 14 10 24 9.2 6.5 15.7 11 3 14 4.7 1.3 6.0 1-Astronomical 383 256 639 15.0 10.0 25.0 19 8 27 19.6 8.2 27.8 28 27 55 18.3 17.6 35.9 34 80 114 14.4 33.8 48.2 2-Aircraft 232 235 529 11.4 9.2 20.6 2 2 4 2.1 2.1 4.2 15 4 19 9.8 2.6 12.4 18 12 30 7.6 5.1 12.7 3-Light Phenom. 32 21 53 1.3 0.8 2.1 2 0 2 2.1 0.6 2.1 2 3 5 13 2.0 3.3 0 0 0 0.0 0.0 0.0 4-Birds 13 10 23 0.5 0.4 0.9 0 0 0 0.0 0.0 0.0 2 3 5 13 2.0 3.3 2 1 3 0.8 2.4 1.2 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. 261 0 261 10.2 0.0 10.2 12 0 12 12.4 0.0 12.4 17 0 17 11.1 0.0 11.1 33 0 33 14.0 0.0 14.0 7-Psychological 36 .9 45 1.4 0.4 1.8 3 2 5 3.1 2.1 5.2 1 0 1 0.7 0.0 0.7 3 0 3 1.3 0.0 1.3 8-Unknown 497 0 497 19.5 0.0 19.5 24 0 24 24.9 0.0 24.9 16 0 16 10.5 0.0 10.5 33 0 33 14.0 0.0 14.0 9-Other 90 28 120 3.6 1.1 4.7 16 0 16 16.5 0.0 16.5 4 7 11 2.6 4.6 7.2 6 0 6 2.5 0.0 2.5 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 22 5 27 10.5 2.4 12.9 9 3 12 6.6 2.2 8.8 165 130 295 9.6 7.5 17.1 1-Astronomical 42 18 60 20.1 8.6 28.7 21 14 35 15.3 10.2 25.5 239 109 348 13.9 6.3 20.2 2-Aircraft 30 11 41 14.3 5.3 19.6 16 8 24 11.7 5.8 17.5 211 198 409 12.3 11.5 23.9 3-Light Phenom. 0 0 0 0.0 0.0 0.0 2 1 3 1.5 0.7 2.2 26 17 43 1.5 1.0 2.5 4-Birds 0 0 0 0.0 0.0 0.0 0 1 1 0.0 0.7 0.7 9 5 14 0.5 0.2 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 0.4 0.6 6-Insuffic. Info. 26 0 26 12.4 0.0 12.4 14 0 14 10.2 0.0 10.2 159 0 159 9.2 0.0 9.2 7-Psychological 2 0 2 1.0 0.0 1.0 1 1 2 0.7 0.7 1.4 26 6 32 1.5 0.3 1.8 8-Unknown 42 0 42 20.1 0.0 20.1 38 0 38 27.7 0.0 27.7 844 0 344 20.0 0.0 20.0 9-Other 6 5 11 2.9 2.4 5.3 8 0 8 5.8 0.0 5.8 52 16 68 3.0 0.9 3.9 </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 GLM-OCR; expect the odd misread word. 312 pages are in the text index: search them above, or from the library's search.