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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.

A if of
Evaluation
0/Balloon
l-Astromaical
2-Aircrltt
3-Ligtit Ptienon.
(•Buds
5-Cloud*. Dust, etc
Hnsuflic. kilo.
7-Psrdnloral
t - I M n o m
Wtoe
Total
Number
Certain Doubtful
•
Tout
, ^
Percent
Certain
S:
Doubtful. Total
; i
\
1
Number
Certain Doubtful Total
\AN
Per Cent
Certain
V
Doubltul
>
i
Total
Numtm
Certain Doubtful _Total,
i
Pet Cent
Certain Doubtful
>>
\ N
Total
Numbet
Certain Doubtful Total
M
Pei Cent
Certain
/
Doubtful
V
Tom
i Evaluation
0-Balloon
•.-Astronomical
!?-Ait«att
,'3-Ligrit Pfienon.
4-Biids '
:S-Clouo\ Dust, etc.
'e-lnsuftic Info.
;;-Psvdiolo|ical
t-Unknoin
W}Uier
Total
Evaluation
0-Balloon
1-Astronoraical
2-Airaatt
3-Li|M Phenoca.
4-Binh
S-Cloods, D m . t i c
S-lnsuNic Wo.
7-Psytholoiical
t-Unkmnm
Wther
Total
A/Ay
Certain
Certain
0
1
0
—6
0
0
1
1
2
0
S
Number
Doubtful
\
Total
T \
Certain
Percent
Doubtful
\
Number
Doubtfu
•Q
0
_0>
0
a
0
0
Q
D
0
0
Total
0
1
0
0
0
0
1
1
J
0
s
Certain
00
7 O.O
0 0
0.1
0-1
0.0
to: o
G.j
) ate
Percent
Doubtfu
0-t
o.c
Iff
f.0
9.9
90
(?•(>
O.o
0.0
O.Q
0-O
Total
Total
0-9
1Q.0
00
0 9
0.0
O.Q
20 0
190
Hb
O.O
100
J~UA/£-
Number
Certam
/
0
2
0
0
3
1
n
1
n
Doubtful
0
1
0
0
0
Q\
Q_
.0
0
0
1
Total
/
/
7
0
o
o
3
;
H
1
/ 3
Number
Certain
0
1
6
0
0
0
1
0
H
Doubtful
0
2
0
0
0
0
0
0
- 0
0
T
Total
0
3
0
0
0
0
0
1
2
0
0
Percent
Certain
7.7
0.0
if4
a
MJ
CO
33)
7 7
US'
7-7
W3
Doubtful
0 0
7-7
0.0
Q.O
o.o
OX
o.p
O.0
0.0
o.O
77
Total
7-7
71
fS.if
O.D
t>.0
Co
23.1
77
JP.g
7 7
/to.
P a Cent
Certain
0-0
I&-J
0.0
9-9
MJ
0.0
o.o
IL-1
33.3
0.9
ui
Doubtful
0-0
33.1
O.O
o.O
0-0
0.0
0.0
C.9
333
Total
90
SO 9
0-0
0.0
0.0
o.o
0 0
••33.3
9-0
loo
Number
;ettain
1.
0
1
0
0
(,
0
g
10
3~i
Doubtful
0
3
2
0
0
0
^2.
. 7
0
0
7
Total
£
5
1
0
0
c
1
9
/0
HO
Certain
is.*
5.0
0.9
-7.6
Q-l
o.o
15.0
O.o
tQ.O
75.0
PeiCent
Doubtful
0J
l.S
r.p
o.o
0.0
0.0
Q.O
s.o
(0,0
Q.O
./7-S
Total
ISO
n-i
5.0
5.5
Q.O
o.o
li±
5-"
7.0.0
2S.0
/go.
Nuaber
Certain
Q
1
0
1
0
o
0
o
0
Doubtful
f?
/
0
0
0
0
0
p
1
Total
6
a
0
1
p
Q
(?
0
3
P a Cent
Certain
0 9
33.3
o.o
W5
00
CD
0.0
0.0
U-7
Doubtful
0.0
33.3
0.0
OQ
0.0
0-0
0-0
ao
{?•(?
33.3
Total
O-i
db.i
ao
323
0.0
00
00
-&&
0,0
/to.
/4c/<i Us7~
NunibH
Certain
6
1
(1
0
(1
2
a6
0
1
Doubtful
0
1
0
0
0
0
0
0
0
0
1
Total
0
•x
0
0
0
7
0
c
0
10
Certain
60
10 0
(1-0
0-b
6,0
00
loo
0.0
CQ.O
o.o
ft.fi
'eicml
Dojbttul
0.0
HO
0,0
0,0
/If)
0.0
M
0-0
9-1
19.0
Total
0.0
70.9
0./)
OB
fir
to
st.e
o.ff
Ct.o
t 0
ICO.
Number
Certain
0
JL
0
0
0
0
(7
0
0
0
7
Doubtful
0
0
0
0
a
, o
a
c
Q_
0
0
Total
0
7
0
0
o
0
0
o
X
•
Certain
0.6
1 00 J;
()•<!
0-9
CO
0.0
Q.0
to
100.0
Percent
Doubtful
0-t
0.0
04
O.o
ao
0.0
0.0
0,0
0-0
O.D
Total
00
If 0.0
9.1
0.0
0.0
0.0
0.1)
o.o
(1.0
Ito.
124

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.