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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.

1
[
Evaluation
0- Balloon
•-Astronomical
2-Aircratt
3-Ui|M Ptienom.
4-Buds
S-Clouds, Oust. etc.
frlnsultic mto.
7Pjychok>|lcll
t-Ui*M>«n
9-Otfie.
Total
i
forAi-S
Kimbei
CertainTOoubtfuiT~Tolal
Mo
476
S3.
_j-
.2DL
-M
All
Hli
I TO. 4f°
[131
JO
fill
39
li'i as\
^
_ { A
0
4?
•>*•?
147
?0l3X0j
Per Cent
Certain | Ooubttul
JL4] S-JB
III
oL
7-3
V-3
1.0
h03
6-0
0-3
11
m
"£?C i.
Total
OLP-I
01
6-1
46
160..
T£ Cf
Number
Certain
77
Jlk
3
^ i .
3
JL
in
Doubttul
_si
JL
4
• 0
0
0
Total
I4o
111
/34
jl
f
7
/ /
177
775
Certain
3.4
ZL
0-1
*£
OA
11
S-6
no
=er Cent
Doubttul
1.0
3 A
0.1
OA
00
0.0
1.0
JLA
I
Total
4 4
4-*
OA
0-2
1-1
J-3
0-1
Certain
7"?
//
101
3
3
3
IA6
\l%
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A
Number
Doubtful
5?
/ /
5-
1
0
0
£
1*1
Total
lit
Lilt
4
3
?
&
F
Certain
M_A5
_ i 3
"•/
f ^ l
tf-l
1.?
A^
3-1
OS
Ih-l
erCent
Doubtful
/ • I
\—&A
6-0
to
d.o
00
ToUl
3.7
0(>
ss
6.Z
6-2
6.1
1-5
d-3
?•?
0.1
Il-Z
- .to
0.7
rt,/
A.I
6-O
JQJL
d.0
O.O
Total
i.r
hi
3.0
Al
0-1
Ifk
3.S
1*
IZ.b
t
Evaluation
0- Balloon
1-Astronomical
b-Aircratt
3'Ligtrt Phenom.
;4-Birds
S-Clouds, Dust, etc
6-lnsutfic. Info.
7*Psycbological
8-UnknOMl
9-Otlier
Total
Certain"
\%
_ i i
31
-A
-1
—A
Numbei
OcKjbtful
^ 1L
0
f! o
JA
Jl
0
o
ToUl
-z
I*
11
Number
lertain
3
a*O
30
Ilk
Doubtful
0
fl1
0
D
V
0
0
0
O
Total
3
1*7
lf>
3,
0
D
1*
o
30
4
334
P«Cent
Certain
AiL
J3.
01
^ML
_ * 1
J>A
O.I
Doubtful
O-o
3.1
ft*
0.0
to
6.0
ftO
to
O.D
Total
d.l
f-7
fil
fib
6*
0.0
cn
d.l
7.0
Li cur GtjiWj Ccu/f A/or KUOW/J
Number
Certain
16
At
2L
4
0
X
%s
1
31
IZ)
Doutittu
14
It
it.
4>
/
/
0
0
0
D
Total
AT
*?
1
1
3
IS
1
3 /
a/1
Pet Cent
Certain
JA
tx
£>.\
JL&
-£L
.£&
JLL
_ ^ a
Doubtful
OS
^ • /

0-3
C-l
0J
O.T
a.i
1-0
i-t
1 - • - - -
i . .. _,! Evaluation
[O-Balloon
!l-Asln)nomical
'2-Aircraft
3-Li|tlt Ptienon.
(-Birds
i-CIouds. Dust, etc.
6-lnsuffic. Into.
7Psychological
B-Unknoan
•Xltlier
Total
Number
Certain
-Jl
-Jl
..Si
11
6
.Jl
1
43
lid
• doubttuT
1
•Xj
. 2.
/
0
r 0
Total
1
3
/
JhX
a\ s"
" T
Per Cent
Certain
o-t
JA
Of
~o\L
O.D
0.5
o.f
A3
Doubtfu
4.3
6-1
OS
i>l
61
0.0
&Q
D.O
Al fit1
4-7 i-y
ToUl
A?
JA
JJ
S3
fix
01
V &
& /
/ J
0"k
I*
E?J-OF Off £/.ew;A'4 &.
D
3
0
£_,
O
n
ToUl
£
/
0
4
2 .
3 4
PerCent
Certain
Ir^
JLH
0 L
I.I
AiL
Doubtful
fil
0.9
0.3
0.0
O.O
O.I
6.0
O.o
00
1.2.
Total
0-3
7.3
O.I
D.P
e.l
A.I
01
II
i-l
Number
Certain
s
l_
JA
Q^
JA.
12.
1
46J
Doubtful
7
7
0
1
3
0
Q
0
O
S I
Total
11
70
O
1
3
ID
4
/ a
z
Jkl
PerCent
Certain
JlA
O.I
JlA
J>A
JLH
JLL
JdH
-AL
JA
rooubttui
0.1
O-l
6.1
0.0
0.1
0.1
O.o
0-0
OJ)
6.0
Total
04
6b
0.0
O-l
0-1
03
0,1
Lion- Suv, Z'oeTeffMMrsCcu.oir
Number
Certain
/
0
3
1
0
0
0
Oj
1
&>
Doubtfu
0
1
1
6
E,
D
O
O
O
7
Total
/
s
4
7.
0
0
O
0
1
0
IB
PerCent
Certain
Al
r-A/j
tX)
^JIQ\
0 /
> _
ax
Doubttul
0-0
_A3|
O.I
01
0.0
00
0.0
0.0
d.0
_dj
Total
41
02.
0-2
0.0
0 0
O.o
0.0
0.1
00
6+
¥M 7
Evaluation
0- Balloon
1-Astronomical
2-Aircratt
3-Lijht Phenon,
4-Bnrb
S-Clouds. Dust. etc.
6-lrttutiic Into.
J-Plycnolopal
t-LWmoan
Mow
Total
\fitisr OR Li-'-
Number
Certaa! Doubttul
L
3
0
6
0
0
0
_ L
5
/
1
D
1
0
O
b
(7
. T o t a l
1
4
0
1
0
D
1
0
T
PerCent
Certain
Q*
0:1
Jl
JO
6-0
00
Afl
O.D
/>•!
6.1
d-2.
Doubtful, ToUl
A.l]ff.l
O.0\ d-l
0-l\ 02
0.0 O.D
AA\-LJ>
JlJ)' .AC
O.0\ At
J>LilAl
Certain
I
^
1
n
0
fi
0
0
h
Number
Doubttul
0
1
0
I
0
0
Q.
t
V
0
^
Total
/
1
1
1
0
6
0
P
0
£
Certain
JLL
JLCt
JLL
-IP
L A B
JLL
JM
'er Cent
Doubtful
64)
6-1
fl-0
OA
6-0
00
0.0
o,\
Total
d.l
O.I
fl.l
fi.b
la
00
0.0
n.i
0.0
Number
:ertain Doubtful Total
Per Cent
Certain Doubtful Total
Number
Certain Doubtful Total
Per Cent
Certain Doubtful Total
141

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.