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.

f
Total Less Aircraft
40
i
30
Per Cent
20
i
10
Aircraft
Per Cent
c
January
February
March
April
May
June
July
August
September
October
November
December
) 10 20 30 4
i i i i
:
i
i
m
FIGURE 25 COMPARISON OF MONTHLY DISTRIBUTION OF OBJECT SIGHTINGS EVALUATED AS
AIRCRAFT VERSUS TOTAL OBJECT SIGHTINGS LESS AIRCRAFT
A-7303