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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.

4£.-
1
! Evaluation
O-Balloon
l-Astfonomical
2-Aircralt
3-Li|M Phenom.
4-Birds
5-Cloudj, Dust, etc
6-lnsuflic Wo.
7-Psycno logical
8-Unknown
J-OBiet
Total
Nunbtt
Certain
17
f
/
0
0
2-
14
1
£~l
Doubtful
13
' 3
0
0>
0
O
/
0
3
_££
Total
3D
II
I
0
0
I,
3
III
Pet Cent
Certain
12-1
'0.J
11
O.O
0.0
7.6
Id
1*1
/•3
610
Doubtful
y.o
0.0
O'O
I?A
o.o
1-3
0-0
//.t>
3J.0
Total
S.0
1*7
1.3
0,0
o.O
Td
4/.o
7JT.7
160.
Number
Certain
//
23
0
/
/
17
X
33
7
133
Doubtful
/?
/o
3
I
o0
0
z_
66
Total
Y7
7-1

ao0,0
/•0
O'O
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Total
jl.S
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l-o
r r
lU
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SL>fi/1~l6H7~ O/V P/./tsTF/r
Number
>rtain
II
9
6
D
0
0
^
0
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t
3
(2.
/
/
a-
0
o
0
0
£7
Total
If
12
If1
1
2_
1
0
II
1
Per Cent
Certain
/y.f
T.I
0.0
0.0
/JA
01
m22
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Doubtful
US
y.j
H.%
/ • y
M
0,0
0.0
0.0
Total
16,3
34.3
14
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1-1
III
113
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Number,
Certain
0
0
/
0
Doubtful
£__
/
3
0
I
0
0
0
0
0
7
Total
4
3
3
0
I
0
I
0
f
JL
If
Percent
Certain
/a.5
/OS
0.0
0.0
0.0
0.0
5.3
0.0
X.S
/i.5
Doubtful
/6£
/j-T
0,0
$•9
0,0
00
O'O
00
$.0
Ji.f
Total
21.6
IS*
is.%
S3
0.0
AO
26.3
16.5
Evaluation
O-Balloon
1-Astnnoinical
Z-Ai rcraft
3-LiJtit Phenom.
4-Birds
S-Clouds, Dust, etc
6-lnsuffic Info.
7-Psyctolo|ical
S-Unknoon
9-Ottitr
Total
Sl/A/l/
J~
OoUbtfu
0
/
0
0>
/
0>
0
c
Total
1
0
0>
0
i
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0
f
I?
7
Pet Cent
Certain
57.1
0.0
M
O.O
O.O
JA
O.O
0,0
(M.
M
Doubttu
0.0
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0.0
0.0
/fh.3
0.0
o.oD.O
0.0
ToUl
f7.l
/#3
t>,0
0.0
0.0
Ith3
0.0
0.0
0.0
/PD.
&ffit;//r£/? r#4/s Alto*
Number
Certain
/ r
/4Z
6
_±
..&XI
3
JLL
_±
}S0
Doubtful
•3
0
0
0
0
6
/3S
Total
31
IfO
?
1
0
XI
71
if
3ZS
Percent
Certain
JA
XA
t.l
l.i
ft.l
to
m
Doubtful
If.I
11H
0?
i>.o
o.o
0.0
0.0
0.0
14
Total
/ M
1-/.t
I7,l
? f
0.0
ox
3-9
l»o,
Number
Certain
/
J
r
UL.
0
0
0
0
1/
__£_
Doubtful
0
?
0
0
0
I
0
Total
/
IX
10
3
• 0
0
0
1
If
1?
Percent
Certain
£ i
75
3.1.)
%-l
0.0
IM
Doubtful
0.0
2-3.1
$J
Jfi
0.0
O.0
0.0
At
ao
oo
Total
lit*
a 6.4
0.0
0.0
0>J
O.o
Number
Certain
s
£
3
/
_L
3
0
JO
0
Doubtful
H-
//
3
/
/
0
£>
0
3
ToUl
f
0
•3
/P
Per Cent
Certain
// .1
6.1
a
M
Si
aIt.5
0.0
Doubtful
7.i
S.l
/•I
/•1
ao
0.0
,?.7
0.0
,f.l
Total
M
LI-3.
3?
AD
S.L
3-1
^ n
Evaluation
O-Balloon
1-Astronomical
2-Aircraft
3-Lfjht Phenoin.
•-Birds
5-Clouds, Dust, e t c
G-lnsuffic' h k .
7-Psycholoiictl
t-Unknomn
9-Othejr
Total
Number
Certain
/
/
0
0
1
c
6
Ooubtfu
/
0
1
0
0
0
0
O

2-
%OJ.
Zf
mo
Doubtful
(31
II
6
A-
3
0
Total
US
3U
If
3£
3W
J£fs
Percent
Certain
f.V
13.1
J1.1
•1A
O.L
6.\
//.I
1.1
3S.\
i.l
m.
Doubtful
t.9
6.L
6-0
o.l
6.*
tf-1
Total
14
1-0
a3
il-1
M
W\
4o
lot.
Number
Certain Doubtful Total
PetCent
Certain Doubtful Total
Number
Certain Doutitfu Total
Per Cent
Certain Doubtful Total
211

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.