Documents / Report
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.
Enlabon
0-Balloon
1-AsmiMial
2-Ai rcraft
3-lieM Ptxnoo.
4-Bir*
S-dowfa, Dust, etc
C-mrfficlrb.
7-PiTd«loral
t-tMaow
Total
Ctrtu"
7
19$
39
1
1
11
7
??
10
I'/J
- A
Nmber
Doubtful
7
111
i i
3
V
i
0
0
0
3
'(9
//£i
i
i
0
q
0
1
us
/£
u -*>
Number
Doubtful
5
28
i f
H
i
0
Q .
0
0
0
S2
0t
Total
8
72
3f?
2
0
1
a
3/
X
161
c
Certain
/.a
213
"f. V
o.i
I). I
0 0
y *
0.0
M.6
n
187
PS
Percent
Doubtful
3 0
u.S
y.,i
o.c
o.o
0.0
0.0
0.0
0.0
31.1
Total
18
1 3 . 1
22 8
3 0
1-2.
0.0
S-t
o.o
ilLL
I 7
I/O.
lertain
7
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i
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f
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183
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Number
Doubtful
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' 7
2
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. $
0
f
S2
Total
/ 7
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83
3
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2
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u
US
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fem
Certain
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17. t-
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5 « C e n t
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liA
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0 8
OH
Of
0 I
1 1
O.P
I t
U.I
Total
7.1
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3/. 0
11
0 8
0.8
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3.0
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Certain
7
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11
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ertain
42
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2.0
f. 2
19.1
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(.8
U
0-8
o.o
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Q-ti'
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i.7
20.1
Total
?A7
?/.7
// 1
1.1
1-1
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c-t
101.
Nuaber
Certain
ft
mAt
s
-f
3
m
8
ITT
665.
Doultfo
f3
ft2
X
1
0
7
(1
i
'81
Total
11
•230
/3 3
7
7
t
l?1
ft
177
TO
852
Per C o l
Certain
C.f
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9-7
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0.1
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Ii.?
i.3
0.2
1.2
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0.2
0. 0
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21. f
Total
io. 7
37.0
IS.1
O.S
0.9
O.i
U.9
I.I
10.&
f'f
/09.
Evaluation
0- Balloon
1-Astmnmial
2-Airuaft
3-Littt Ptmoa.
4-Binb
HTIouds, Dust, etc
t-haiffic kilo.
7-PsydiolO|ical
(•UBknow
9 0 V I M
Total
•JjfWyC^J /9/ft L.GSS
Nunbn
Certain
0
1
A^
Q
0
0
0
0
0
1
10
Doubttu
0
I
0
0
o
o'
6
0
0
0
1
Total
0
IO
a'
0
0
0
0
0
o
1
II
Percent
Certain
O.P
mID
O.O
t.o
O.O
00
o.o
o.o
1.1
919
Dourjffu
o.o
91
OJ
0.0
0.0
t,t
0.0
o.o
oo
00
f.l
Total
0.0
p. SSCO/VPS
Niiaber
Certain
£
0
D
_L
D
• O
0
6
Doubtfu
O
J~
O
P
P
P
0
Total
0
K
o
p
p
(?
O
o
P
r
Per C o l
Certain
JSS.
0-0
00
00
a
no
0.0
7r.o
Dm MM
O.0
#0
O-C
0.0
c?£>
00
00
P.O
Total
00
/06A
#O
00
0-C
#0
0.0
0-0
0.0
/0f.
Nunber
Certain
/
0
0
0
0
2
9
C
1
Doubtful
0
0
1
0
0
-0
0
i
0
0
2
Total
/.
1-
1
0
0
0
7
1
i1
He
Percent
Certain
15.0
o.o
o.o
0-0
0.0
/z.z
0.0
C7
87.5
Doubtful
0.0
on
12
1.0
0.Q
0.0
CO
C2
1.0
0.0
Total
C-2
15.t
a0.0
o.O
0.0
/M
C-1
17$
0.1
loo.
3/-6/J Seco/if'tS
Nunber
Certain
2.
o
a
a
?
Doubttu
0
(
1
D
0
0
0L
t
^2
0
Total
0
3
/
o
• r£S
N a b s
Certain
a
0
/
a
a
0
s
/
/0
Doubtful
o
0
&
<?
o
0
0
?
0
o
0
Total
/
6
1
0
</
/
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r-erCent
Certain
no
JJJ
Off
It.O
0.0
00
lo.O
o.o
W.O
It.O
no.
Doubtful
0.0
o.o
0.0
O.D
o.o
o.o
0.0
oo
00
0.0
0 0
Total
iOO
o.o
to
10.0
0.0
o.o
\W0_
O.II
'(O-O
,1.0
100-
£- io r^iniores
Ninon
;ertain
0
<^
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3
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Doubtful
0
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a
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f?
• 0
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o
0
Total
0
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l
2
0
f
Per Cent
Certain
o.o
0.0
0-0
0-0
0.0
o.o
(0.0
o.o
uo
0.0
JO 0.0
Doubtful
o.o
~~oT"
o.t
o.o
1.0
0.0
0.0
M
00
q.9
0-0
Total
0.0
0.0
KO
0.0
0.0
0.0
(.0.0
0.0
¥0.0
O.D
no.
Number
Certain Doubtful
v
\
\
Totll
0-
Per Cent
Certain Doubtful Total
tfor £TAT~£:O
Number
Certain
/ • /
/
Doubtful
0
a
0
0
0
/
{?
0/
if
Total
Af
'X
/
<?
0
7
y
/-?
Percent
Certain
a.
i . l
0.6
0.0
il. ?
5.)
?o.3
?J.7
%.s
Doubttul
0.0
£•$
00
0(1
0(1
00 .
oo1.1
00
oo
#.s
Total
(•9
1-1
00
0-0
t~iiT
CB
00.-i
23.7
HO
153 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.