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Project Blue Book Special Report (second copy)

Internet Archive · 309 pages · text from the file's own layer

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.

e
Evtfution
'O- Balloon
lAstrononieal
2-Aircraft
3-Ligtil Ptienom.
(•Birds
S-Clouds, Dust, etc
6-lnsuflic. Into.
7-Psyctological
t-UnluMM
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J awvAet/
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, t
0
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0
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2
2
2,
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0.
0
4
Total
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6
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0
1
7
A
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0.6
133
J13
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0$
OA
26J_
Total
0,0
6.0
6-0
15. ?
133
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Number
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4
2
(?
5
Z
Doubtful
2
P
0
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Total
4
6
6
6
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0
5
2
18
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83.3
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176
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fit
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Total
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ir*
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ys
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43
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Total
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a A
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Number
Certain
43
45
5
35
13
3-74
Doutitfu
41
xi
4 3
0
i
Q
1
0
5
1X3
Total
77
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1
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Total
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5
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/ 4
2.
60
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12
ft
1
1
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0
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Total
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4
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/
^ .
ft
3
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ML
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o.O
43
ad
15.1
-23.
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43
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a.d
Ad
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Total
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3SX)
ff$
+3
S4
II
4-3
d.0
ii-2
33
/•
Number
Certain
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5
3
2-
6
0
4
1
ff
Z
Doubtful
f
8
3
1
6
t
C
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0
0
_?3-
Total
II
13
t
3
4
'1
2.
P « Cent
Certain
^ ^
4i
3-0
0.0
V V
it
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0.4
U-1
f-1
SO
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do
Total
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lf.4
45
OJO
60
l-i
jg.4-
100-
Number
Certain
y
/
6
3
0
23-
3
4-1
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3
<?
0
0
0
6
0
d
d
Total
J
zo
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1
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3
0
•22.
3
id
PerCoit
Certain
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ft.1
t.i
o.b
6.6
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+.1
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Doubtful
O.d
6.0
Q.d
0.0
fi.d
Total
^ ^
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A5
0.0
0-6
4.L
0.0
33.4
100.
115

Cases discussed

About this file

Report, cited by the archive. The PDF is mirrored here; the original link is under it. 309 pages are in the text index: search them above, or from the library's search.