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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No. of all sighting
3201
All yeors
117 205 164 306 160 2018
O
Location
not
stated
Outdoors
In bldg.
In plane
In car
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/
/ '
&
s
\
\ \ \ \ \
\
\ \ \ \ \
4
1
1
1
1
1
1
1
1
1
1
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s
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• -
1947 1948 949 1950 1951 1952
100
9 0
•8 0
70
• 6 0
50
•40
•3 0
•2 0
• 10
.0
FIGURE 17 DISTRIBUTION OF ALL SIGHTINGS BY OBSERVER LOCATION FOR ALL YEARS AND
E A C H Y E A R