Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects)

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Total Less Unknown
Unknown
Per Cent
Per Cent
30
25
20
15
10
5
0
0
5
10
15
20
25
30
5 seconds
or less
6-10
seconds
11-30
seconds
"'
31-60
...a
seconds
61 seconds
5 minutes
6-30
minutes
More than
30 minutes
Not stated
t
FIGURE 21 COMPARISON OF KNOWN AND UNKNOWN OBJECT SIGHTINGS BY DURATION, 1947-1952
A-7499