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

United States Air Force, Air Technical Intelligence Center · 1955-05-05 · 309 pages · text from the file's own layer

Special Report No. 14 was issued by the U.S. Air Force's Air Technical Intelligence Center on 5 May 1955. It is a statistical study of about 4,000 reports of unidentified aerial objects from June 1947 to December 1952. The reports were reduced to IBM punched cards and analyzed with methods including chi square tests. The report concludes that the reports it examined are very unlikely to represent technology beyond present scientific knowledge, and it notes that no case produced valid physical evidence.

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1 EnlMlxxi
O-BJIIOOI _
] ASIIDOOPIOI
7-Aircraft
3-Li(til PMKM.
4-BirCts
S-Clouds, Dust, etc
S-lraiftic M b .
7-P»y*olofcil
S O D *
T o t *
Nunber
Certain
Psydnlo|ical
'S-Unknoan
Wither
Total
, Evaluation
O-Balloon
' l-Astronormcal
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,3-LiJtit phenoa.
4-Binfe
5-Clouds, Dust etc
6-lnsulfic kifc.
7-Psycholofial
8-Unkrnnn
tOtner
Total
Certain
,
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c
c
0
1
£
Nunber
' Doubtfu
0
/
0
0
0
0
0
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Total
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1
0
(/
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0
2
0
1
1
7
V
Certain
/ f 3
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0.0
9.0
i.O
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0.0
V-i
Percent
Doubtfu
0.0
0. C
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O-o
0.6
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28. (,
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113
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0
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3
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Number
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0
0
0
0
0
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3
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13
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Number
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Total
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Q.0
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30.3
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0.0
0.0
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00
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MA
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Per Cent
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10-0
10.0
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20.0
Total
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100.
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0
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20
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0
Q
q
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0
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1
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7
5
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0
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2 /
PerCent
Certain
4.8
33.3
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0.0
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9.0
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0.0
4.8
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o-o
Q.O
0.0
0.0
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Q.O
t.9
Total
719
O.O
o.o
o.Q
't.9
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tf.9
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Nunber
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7
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2
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c
0
0
0
0
0
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Total
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0
c
0
0
0
/
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1
Percent
Certain
13.3
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13-3
0.1
0.0
0.9
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0.0
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c.i
73.3
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0.0
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0.0
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o.o
0.0
0.0
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Total
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ap
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9.9
33.3
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0
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2
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16
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Number
Doubtfu
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1
0
0
0
0
0
0
a
7
Total
7
7
S
0
. 0
0
0
(,
1
Number
Certain
?
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0
0
0
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I
2
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11
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f
3
0
c
0
0
0
6
0
0
7
Total
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1
0
0
0
1
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0
24-
Certain
8.7
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17-f
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9.0
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8-7
0.0
26-1
y . i
\61.6
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Certain
£3
31.5
4-2
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0-0
A.O
*•?
1-2
4.2
10-2
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9-3
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0.0
Q.O
o.O
a*
30. f
PerCent
Doubtful
U.I
\Jlli
0,0
0-0
0.0
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0-0
0,0
0.0
0.0
Total
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00
Q.Q
O.0
Q.O
H.3
100.
Total
50.0
f.x
Q.O
0.0
Q. 0
4*1
t*l
8.1
H.l
109.
120
\

Cases discussed

About this file

Analysis, from the classic collection. 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.