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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O
100
No. of object sightings
70 55 83
9 0
£ 8 0
JZ
rou
0>
§ 6 0
v>
SI
50
o 40
o
UJ
o ,30
c
O 2 0
10
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0.
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec
FIGURE 14 DISTRIBUTION OF OBJECT SIGHTINGS BY MONTHS AMONG THE EIGHT DURATION
GROUPS FOR ALL YEARS
• • - • &
A-7492