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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.

Open the PDF at page 124 Original source ↗

“Otis”1 page

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* • # •
Percent
Certain
\
v
Doubtful Total
Ertnbon
O-Balleea
1-AstnnMial
2-Aircraft
3-LiiM Phenon.
*-Biids
5-Clowh, out. ttc.
6-lnniffic. K b .
7-Piydiolo|ial
8-IMantm
9-Qtht>
NnriM
Certain Doubtful ToUl
rs •
V
PeiCent
Certain Doubtful Total
Number
Certain
i
0
2
0
6
0
~T
I
H-
1
12
Doubtful
0
1
0
0
0
0
0
0
0
0
1
Total
;
/
X
a0
0
3
/
4-
/
13
Per C w l
Certain
7.7
9.0
IW
CO
Q.Q
O'O
7il
3230.2
m
DoubtM
9J
7-7
OJ
M
o-d
O.O
Q.O
Q.O
O-o
gj
7.1
Total
1.1
-J.I
H-f
9-e
o.o0-0
•J3-J
7.7
30.9
7.7
no.
Number
;ertain
Q
_!__
0
i
0
0
(>
0
Doubtful
9
3
2
0
0
0
0
1
0
0
7
Total
c
s
2
/
0
0
(,
X
1
/5
n
P a Cent
Certain
13.0
4-7
0.0
2.2
0.0
0.0
I3.Q
0.0
37.6
Doubtful
0.0
0.0
o.o
0.0
o.o
0.0
o.o
15- X
Total
13.0
10.2
0.0
Q.O
If.O
f.i
(00.
Nun bet
Certain
0
Q
0
0
0
0
2
0
0
10
Doubtful
0
1
0
0
0
0
0
0
Q
1
Total
0
3
0
0
0
0
I
0
0
Q
II
Percent •
Certain
0,0
18-7
t:t
CO
Q.P
0-6
if. 2
Q.O
l.Q
90.9
Doubtful
0.0
1.1
0.1
0.(1
0.0
0.0
9.0
OJ
o.o
OJ
tl
Total
p.o
27.3
0.0
0.0
0.0
o.o
IB. I
0,0
o.O
IOC
c Evaluation
O-Balloofi
1-Asomoaical
2-Aircnft
K i | h t PhenM.
4-Birds
i-Clovds, Dust, etc
6-hsuffic Ufa.
7-Psycliolo|ical
S-lMnow
Mttier
Tolal
N w b a
Certain
0
1
Q_
0
0
0
1
1
.?
n
C
Doubthi
0
0
0
0
0
0
0
Q
0
0
0
Total
0
1
0
Q
0
0
1
1
3
0
Q
P a Cent
Certain
0.0
ten
CO
OJL
0.0
Q.O
!(,.!
(6.1
50.0
D.O
100$
Doubtfc
o.o
0.0
0.0
o.o
Q.O
(I-0
0,0
0.0
Q.O
0.0
0.0
Total
IC.1
0,9
9-0
0.0
0-0
Ib.l
It,.-]
fro
o.o
Iffo.
Nuabef
Certain
0
$
0
0
0
0
0
1
7
0
11
Doubtful
0
2
o0
0
0
0
6
0
0
1
Total
0
10
0
Q
0
0
0
1
0
/ 3
Percent
Certain
O.O
tV.J
0.0
0.0
(.0
o.o
0.0
7.7
0.0
BU
Doubtful
0.0
11-1
O.t
o.t
$.0
o.o
0.0
0.0
o.o
0.0
/S.I
Total
0.0
U.I
o.o
1,0
o.o
QO
o.o
11
IS*
(!•&
• '
100.
Nuiabet
Certain
0
• 1
0
1
0
0
0
0
0
0
2
Doubtful
0
1
0
0
0
0
9
0
0
p
1
Total
0
%
0
1
0
0
0
0
0
0
1
P a Cent
Certain
_M
23.)
0.0
13.3
O.t
O.O
0.0
O.O
0-0
0.0
Doubtful
0.0
33.3
Q.O
0.0
OJ
0.0
0.0
0.0
Q.O
OJ
33-3
Total
OJ
cu,OJ
333
0.0
o.o
(3.0
o.o
o.o
o.o
It*.
Number
Certain
0
0
0
0
0
J2_
0
0
0
0
Oouutfu
0
0
0
0
0
0
0
0
0
0
0
Total
P
5
0
0
Q
0
0
0
0
0
5
Percent
Certain
o-o
It 0.0
0.0
O.o
0.0
0.0
o.o
0.O
o-o
Q.0
IH°.Q
Doubtful
0-0
0- o
Q.O
O.O
OJ
0-0
0-0
6.0
o-o
0-fl
o.o
Total
0.Q
/0O.O
0.0
0.0
Q.P
o.o
OJ
ap
OP
/oo.
117

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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.