Documents / Report

Project Blue Book Special Report (second copy)

Internet Archive · 309 pages · text from the file's own layer

This is Project Blue Book Special Report No. 14, "Analysis of Reports of Unidentified Aerial Objects," Project No. 10073, dated 5 May 1955. The study reduced about 4,000 sighting reports received by the U.S. Air Force between June 1947 and December 1952 to IBM punched cards and analyzed them statistically, including chi square tests comparing knowns with unknowns. It concludes that the reports very probably do not represent technological developments beyond present scientific knowledge, and it notes that no case produced physical evidence.

Evaluation
lo-Balloon
1-Astronomcal
Z-Airciaft
3-Li|M Phmom.
4-Buih
S-Clowb, Dust. etc.
6-lnsufIic kilo.
7-Psydnlo|ical
«-Unknown
^OBiei
Total
Certain
n
iz.
•0
—M
0
It
£
Number
Doubtful
-1-
(6
2.
0
0
_
ft 7
[~ Total
r0
71
1-12
;
'erCent
Certainl'Doubtful
f.P
IL1
6.0
-Ma
33.3
SJL
7SH-
J.f
7-S
1.0
0.9
o.t
0.0
0.0
0.ff
o.o
21. ( ,
Total
M
l%?
6.1
0,1
AS
Ml.
0.0
fit.
lertam
a
I'T
f?
9
jl
t-7
3
j t
2a/
Number
Doubtful
>W
6{
77
1
A*
_T
. 0
1
0
7
3-13
Total
I£7
I7H
m
t
7
18$
3ff
7sy
^ -
Certain
If-*
I/.0
A i l
0,3
0¥
fV
9/.f
>er Cent
Doubtful
f.7
1.2.
0,7
0.0
e,l
0.1
£ g . l
*1*
Total
1L3
HA
1,0
1,0
I f
loo.
Number
;ert*n
7J
ft
t¥
6
1
//I
2-0
/O3
2.7
[Doubtful
ST
i t
If
1
0
f
Total
13/
iru
Iff
?
Ill
u
If -1
7?V
f
Certain
U
(I.I
/.%
0.9
6,1
(1.0
3.H
S9.S
ei Cent
Doubtful
21
S3
f/.X
/ • /

3.7
Doubtful
0,0
p.p
ff.r
l.f
Ai.O
Tot at
>2J1.
SiJSS
/ • /
AJL-
1.6
3.?
1LA
rS
Evaluation
O-Bslloon
l-AstTHiomical
Z-Aircraft
.3-Light Phenom.
IBurls
:S-Clouds, Dust, etc
•6-lnsuffic. Info.
;7-Psychobtical
18-Unknown
9-Ottier
Total
Certain
j
rt?
0
^_
^ _
r
J3
Numbei
Doubtfu
c
0
a
a
o
1
Total
£
0
o
6
Per Cenl
Certain i Doubtful' Total
JLAAL -LL
llA o-Ol+l
7.1
0-6
/UL
V-7
UL1
Ul
j
0.0
00
0.A
0.0
7-1
t-6
Hi
0,(i
it-3
?Al
0
/
0
Total
/
6,
/
0
6
/
7
Percent
Certain
9-1
S£
00
00
221
Doubtful
6.6
/U
00
0.0
0-0
Oi
o,o
Total
96
r
Certain
/
C,
O
--A
_ ^
0
__£
• O
Numbei
Doubtfu
_z
0
I
0
0
a
0
0
6'
Total
9
'1
j_
0
0
2.
0
n
PwCent
Certain
0.0
jLd\
-OA
ML
-0&
Doubtfu
fit,
0-0
00
0-0
0-0
0-0
f?y
Total
If, ff
0?
//:•?
0-0
0-0
• 0.0
0(1
on
(00.
;/}r/
f9 f t
-I'T
Number
Certain
&
-X
_Z-
0
f
Doubtful
S"
0
1
(P
0
0
/
/3
Total
/I
3
3
0
/
Y
n
PerCenl
Certain
/fi
sz
h ^
si
121
Doubtful
o.O
6.6
6 J)
CD
Oi
* • /
Total
111
71,0
0-0
'?•/
zoo.
/&// ?~/Ai(
Dae//
Number
Certain
0
z
0
/s
0
•$
0
HO
Doubtful
Y
lY
Y
0
0
0
0
0
Total
9
1 3
/
0
1 "3
1
70
/? */ 61
PwCent
Certain
ILL
AA
X5-
JJL
ill
Doubtful
fi
0-0
0-0
6-0
•0-0
o.Q
U
Total
\% (•
i.f
o-O
CO
U
-/*JC >a /£. /
Number
Certain
1
/
/
/
£>
Doubtfu
0
0
0
r)
Total
fi
/
0
d
/
%
Certain
60
f2.5~
(IP
f?-0
o-o
/2.r
74.0
Percent
Doubtful
0-0
0-0
0.0
0-6
(?-fi
0-(l
fi-fi
Artain
1/
/2
7
2
0
IX
0
3
Doubtful
6
f^
/
&
/
C
0
0
0
0
Total
y
*'7
0
%
0
/ 3
0
,/
ft
Per Cent
Certain
22^
0-6
Sz.
JJL
111
Doubtful
6-0
1-7
00
0-f)
00
n-(\
0-0
o-o
rtf*
Total
67
0-0
o,t>
S.7
1-1
/to.
Number
Certain
-AAL
0
0
_ £
1°
<l_
u
Doubtful
J
0
0
0
0
0
0
Total
i
10
0
0
0
9
10
Y
ft t/
Percent
Catain
SL
-LSA
6.0
££,
Qo.i
Doubtful
ff
u00
0.0
6.6
0.0
fi-0
0-f)
If-2
Total
ico
0-6
0.A
fi.fi
12-Q
j j j
ioo.
134

Cases discussed

About this file

Report, cited by the archive. 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.