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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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A/i,
Evaluation
0-Balloon
lAstnnomical
2-Airtraft
3-LiIht Ptienc*.
4-BirHs
5-Cloudj, Dust, elc
6-lnsiflit Wo.
7-PjydBlofical
S-UnkMM
»-Othet
Total
Number
Ortun
2
L
__d
_£_
__£
$
0
5
1
JJ
Doubtful
/
1
1
0
n
0
0
Q
0
0
s
Total
3
%
0
0
0
s
0
5
1
17
Per Cent
Certain
/0.5
JA
0.0
0.0
CO
6.0
SCl
O.C
•2CI

o.c
0-0
o-o
(1-0
; «
•15.2
IS. 2
IDS
Oj
oJ
o.O
o.o
2C.3
IOO-
Number
Certain
/
0
0
0
0
01
_ rtjn
—1,
0
i
a
dL
_J_
ii
t
Doubtful
0
1
1
0
0
0
0
0
0
0
X.
Total
0
%.
1
0
0
0
0
o
s
0
Per Cent
Certain
an
u.%
Q.I)
O.C
Q.O
CO
o.c
. o.o
fO.O
Doutttul
Q.Q
/O.I
H.I
^_.0.C
o.c
JLLJ
CO
c.o
O-o
fl.il
Total
0.1
33M
U-l
U
O.O
0.0
0.0
O.C
sic
6.0
100.
Number
Certain
D
0
T l
G
0
_ i .
0
- r
3
Doubtful
0
0
0
0
0
0
0
0
0
0
0
Total
0
0
\
0
0
0
a
0
0
C
3
Per Cent
Certain
OJ
J3-3
O.D
o.o
Jli
110.0
Doubtful
10
0.0
0.0
OJ)
d-d
OJ
Q.O
Q.0
o,o0.0
o.o
Total
Q.0
o.o
33,3
0,0
Q.0
0.C
£6.7
0.0
o.O
0.0
iQQy
1
1 Evaluation
O-Balloon
l.Astronomical
2-Aircraft
3-Lirht Phenoo.
4-Bints
5-Clouds. Oust, etc
6-lnaiflic Into.
7-Psycliologiul
B-UnknoM
VOthcr
Total
Number
Certain
7
0
r\»-/
c
L
0
t
Doubtful
0
Q
0
1
c
D
(1
0
1
Total
?
0
/
0
1
0
0
0
1
0
5"
PerCent
Certain
L.C
7M-.
e.t
CO
Doubtful) Total
Q.Q
0.0
OH
Q.0
HU
0.0
210
?o.j\m
L.J
o.o
•j c.o
m
cfi
o.O
no
li.l/
3J
OJ
10.0
o.o
mo.
J~u/vr
Number
Certain
0
0^
1
0
0
0
~T
0
0
1
Doubtful
Q
j
0
0
0
0
0
0
t
0
0
Tolal
9
i
i
0
c
0.
0
0
0
I
1
Percent
Certain
Q.O
Ml
ML
ro.o
M.
rS.Q
0.0
CO
00
im
Doubtful
C.9
Q.O
Q.O
O.O
Q.I
O.O
(l.Q
o.o
i,0
0.6
o.O
Total
0.0
an
Q.Q
(?.«•
C«i
1.6
Q.D
m.
J~oc-y
Number
:ertain
0
(
J_
Q
0
0
0
_A
_j_
T
Doubtful
0
?
0
0
0
0
9
1
0
0
3
Total
O
3
1
O
0
0
4yl
3
1
1
PerCent
Certain
u
ILL
li.l
1.0
Q.O
Q.O
Q.Q
.m//•I
UJ
Doubtful
op
mo.o
Q.O
O.Q
o.o
0.0
li.l
OJ
0.0
•33,3
Total
O.o
33-3
li.l
C.Q
o.c
Q-P
o.Q
li.l
n-i
mo.
Number
Certain
/
0
/
1
0
Q
S
0
7
/
/s
Doubtful
1
c
o
/
o
o
Q
O
ft
o
2
Total
7
0
/3
0
0
3
o
7
/
17
PerCent
Certain
Mr
ILL
ILL
0.Q
JtLl
9S.7
Doubtful
S.9
Q.O
0.0
*7
0-0
0.Q
0.0
0.0
0.0
0.0
II. g
Total
II. B
0.0
S'l
'7-7
CO
0,0
n.i
Q.O
fl-7
Ho.
Evaluation
O-Balloon
1-Astrenoaical
2-Airaaft
3-Ligtit Ptienoa.
4-Birds
5-Clouds. Dust, etc
6-lnvjftic. Info.
7-Piycho logical
8-Unkno«n
9-Other
Total
Number
Certain
/
_ / .
0
0
0
0
8
-7
n.i
S-f
o.O
0 C
o.o
II.9
o.O
Hi i
11.2
ICO.
Number
Certain
/
L
f
0
__£
0
r
0
1
L
Doubtful
0
1
1
0
0
0
0
• o
0
0
3
Total
/
7
6
0
0
Q
9.
C
?•
/
PerCent
Certain
K.Q
MMA
CO
Q.O
Q.Q.
o.c
37.5
H-7
Doubtful
o.o
M
9. 3
0.0
o.O
CO
(1-0
0.0
O.o
c.o
/2.S
Total
1.1
no
O.c
0.0
r>.Q
0.0
• 0,0
V-5
H.I
ml
Number
Certain
0
T
1
o
JL
JL
1
JL
0
<3
II
Doubtful
/
4
0
0
0
o
0
0
Q
0
Total
/
n
%
0
0
o
/
o
0
o
Pel Cent
Certain
0-0
SCO
/S-6
AJL
-MJ
0-0
j£_
O-Q
Doubtful
6-1
X.o
0.0
OJ
OJ
0.0
0.0
' 0,0
0.0
o.o
31.2
Total
C2
n.o
124
Q.Q
O.c
0-0
6-3
Q.O
CO
0.0
I0Q.
Number
Certain
/
1
0
0
0
1
J _
/0
10
Doubtful
O
1
o
0
0
A
o
0
O
0
1
Total
/
0
0
Ci
1
1
1
0
II
PerCent
Certain
"77
0.0
0.0
0.0
?./'
1.1
1.1
CO
70.7
Doubtful
Q.0
1-1
0J
O.O
c.o
o.c
O.O
0.0
0.0
0.0
?•/
Total
21.}
u-<t
O.C
Q.O
Q.O
1-1
1-1
1-1
OJ
100.
121

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.