Documents / Report
This is Project Blue Book Special Report No. 14, "Analysis of Reports of Unidentified Aerial Objects," Project No. 10073, dated 5 May 1955. The study reduced about 4,000 sighting reports received by the U.S. Air Force between June 1947 and December 1952 to IBM punched cards and analyzed them statistically, including chi square tests comparing knowns with unknowns. It concludes that the reports very probably do not represent technological developments beyond present scientific knowledge, and it notes that no case produced physical evidence.
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CODE 43 OBSERVATION METHOD X Variable Y 0 Naked eye 1 Eye glasses 2 Window 3 Windshield 4 Binocular 5 Telescope 6 Theodolite 7 Radar 8 Photographic 9 Other CODE 45 COLOR X Y 0 1 2 3 4 5 6 7 8 9 Variable Metallic Light-glow-luminous Red Orange Yellow Green Blue Violet Black White £ODE 48 SPEED X Y 0 1 2 3 4 5 6 7 8 9 Variable Hovering, stationary Less than 100 m.p.h. 100-400 m.p.h. More than 400 m.p.h. Meteor like Not stated Other CODE X Y 0 1 2 3 4 5 6 7 8 9 CODE 44 SOUND X Y 0 1 2 3 4 5 .6 7 8 9 - - - - _ — — Variable Motors Jet or rockets Explosion Unlike aircraft r Hiss, swishing, whining Rumbling Humming or buzzing None Not stated Other • NUMBER CQDE 1 2 3 4 5 6 7-10 1 1 - 2 0 2 0 - 3 0 31 or more CODE 49 SHAPE X Y 0 1 2 3 4 5 6 7 8 9 Variable Ellipse Rocket X Y 0 1 2 3 4 5 6 7 8 9 Conventional aircraft LI LIGHT-COLOR Variable White Black Grey Red Orange Yellow Green Blue Violet Other Unconventional aircraft Meteor, comet Lenticular Conical Tear drop Flame, tails, fire Other 292
Report, cited by the archive. The PDF is mirrored here; the original link is under it. 309 pages are in the text index: search them above, or from the library's search.