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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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Evaluation
O-Balloon
1-Astronomcal
2-Aircraft
3-Lisht Pherm.
•-Birth
5-Clowis, Dust, etc
6-lnsuffic kilo. ,
7-PsYcholopal
8-UnkMM
M i n e r
Total
Nunbff
Certain Doubtfu Total
y
PerCent
Certain
7
Doublfu Tobl
Nunter
Certain Doubtful Total
-
,
V
P a Cat
Certain
J
y
DoublU
\
Total
Number
Certain Doubtful Total
A
Percent
Certain
/
A
* V
y
Jtouttful Total
Nuabrr
Certain Doubtful
\
Total
V
PeiCml
Certain
y
DtaiMlul
tj^>
Total
Evaluation
0-Balloon
1-Astnmnical
2-Aircnft
3-Light Phenom.
«-Binh
5-Clowts, Dust, etc.
6-lnsuffic kito.
7-Psycholo|ical
S-Unknoon ;
M t h e t
Total
Number
Certain Doubtful
s
Total
\ )
PerCent
Certain Doubtful Total
Numbn
Certain
/
0
o
.JL
1
1
U
Doubtful
0
1
Q
0
/?
0
0
0
O
0
1
Total
/
/
0
0
o
3
1
U
I
/,?
Percent
Certain
*7
p.e>
p.o
7.7
7.7
12.3
Doubtful
a?
7T
fit
at>
to
0,1
oti
4P
4t
0.0
7.7
Total
77
7-1
JS:o
&,e
6-e
Q.a
71A
7,7
r.?
/0O,
J~L>J.f
Nuc*M
:ertain
6
5
0
1
o
o
f
o
IZ
JtL
Doubtful
D
I
",£
0
P
0
0
0
D
7
Total
7-
(>
O
r.2.
13-
16
S!T
PerCent
Certain
/ / r
9.1
0.0
i *
0.0
ao
/«.S
0.0
XI f
29.1
87,3
Doubtful
0,0
?.(,
0,0
0$
7,t
0,0
9-0
H,1
Total
/(?if
/,f
ao
(?.O
Mr
7-11
160,
A usurr
NrabH
Certan
t>
i
0
0
0
p
0
7
0
IT
Owtitfu
0
1
a
Q
0
0
0
a
0
1 e.
/
Total
P
7
(?

t>,e
p.o
00
w
I?S
0-f
Aff
00
/OP.
Evaluation
0-Balloon
1-Astfononical
2-AircraH
M i g h t Phenoa.
4-Binb
5-Clouds, Dust, etc
6-lnsuffic Info.
7-Psycholocieal
8-Unknom
M t h e t
Total
SE-p7-jrMg£r/<>
Nmber
Certain
0
/
o
0
0
0
1
(
3
0
/
Doubtfu
0
o
0
0
0
0
0
0
10
o
0
Total
0
t
0
0
0
0
1
1
0
PaCeat
Certain
0.0
fC7
M>
P.fi
0.6
(LI
if-7
SB.O
0./)
(00,0
Doubtfu
(?,0
OO
0-0
(?,6
M
?,
P
0
0
0
/
2.
O
12.
Doubtful

00
0.0
0.0
fl.Q
6.0
Doubtful
P.0
T?J
O,0
0,0
0,0
04
0-0
00
0.0
0,0
Total
p.o
tfifi
0,0
313
o.e
0.0
0,0
o.o
0.0
0,0
106.
Numbet
Certain
o

6.0
0.0
0.0
at
0.6
o.t
o.o
ao
/OOJ
Doubtful
A0
0.0
0.0
0O
0-0
IP-O
0-0
ao
Tom
op
mo
t,o
Ob
60
00
Q6
0.0
110

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.