Project Blue Book Special Report (second copy)

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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IW. 125° 120° 115° 110° 105°
KEY: IN EACH SUBDIVISION THE TOP FIGURE
INDICATES THE FREOUENCV OF ALL
SIGHTINGS, THE MIDDLE FIGURE UNIT
SIGHTINGS, AND THE BOTTOM FIGURE
OBJECT SIGHTINGS
25° .
FIGURE 31 FREQUENCY OF OBJECT, UNIT, AND ALL SIGHTINGS WITHIN THE UNITED STATES 1947-1952, BY SUBDIVISIONS
OF ONE DEGREE OF LATITUDE AND LONGITUDE