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.

100-
80-
60-
40-
3-10 objects 11 or more objects
Astronomical
-100
-80
-60
-40
Unknown
Others
Insuf. info
FIGURE 12 DISTRIBUTION OF OBJECT SIGHTINGS BY NUMBER OF
OBJECTS SEEN PER SIGHTING WITH EVALUATION DISTRI
BUTION FOR EACH GROUP A-7490
28