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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.

Evaluation
0- Balloon
1-Astronomical
7-Aitciitt
3-Lignt Phenom.
«-Bud$
5-Clouds, Oust, etc
frlnsufric. * * > .
7-Piy rtoloji a l
1-UnluioMi
9-Otfiei
Total
Certain
o
o
c
c
0
• •
i
a
/ 0
Numbw
rDoubttuJ
C
• >
0
o
r
o
^
o
Q
[Jotal
/
h
0
c
0
Percent
Certain
7 7
73 I
Q-0
at
e.j
IS-H
l5Jt
71.1
Doubtful Total
0. 0\ 7.7
?3./
0.0
aJ
o.n
Q
0.0
-Ml
Co
O.o
tt-2
Total
6.1
14.1
33/
IX
It
op
12-2
'2
2f
tpO-
f
1 Evaluation
0-Balloon
l*Astroooniical
2-Airciaft
;3-Li£ht Phenom.
4-Birds
S-Clouds, Oust, etc
'6-lnsuflic Into.
! 7-Psycholojical
B-UnluWM
9-OttlH
Total
Evaluation
0-BaMoon
I-Astimomical
2-Airciaft
3-Lifht Pfienom.
t-Binh
5-Clouds, Dust, etc
6-lnwflic. t i h .
7-P5ycholo|ical
8-Unkno«n
9-O0t«
Total
l/4K
Numbei
Certain
/ /
• 4
If
3
%
^_
- •
lO
-A.
63
Doubtfu
1
->
>9
D
-
$
1
16
Total
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-21.
0
'6
„'
tc
1
77
Certain
HI
3.8
CO
7'
t?i
PerCent
Doubtfu
1 2
2-5
'3 1
0-O
0-0
fio
.D
0$
ft.3
Total
in
2
o-l
20.3
Total
/'f
*\0
23. (
Ol
00
fit
ft-*
2J_
JJJ.
9/
*>£-/?>
Numbei
Certain
3
£
.3
Q
1
c
q
0
-LL
10
Doubtful
f
9
f
1
o
0
0
1
V
Total
' 2
If
in
_x_
%i_
0
II
3
(cl
Pei Cent
Certain
H.I
18
f.f
to
PO
CC
0.0
WO
'3.3
Hi
Doubtful
IV.&
n./
Iff
3-3
!•(.
dp
6,0
a?
!•(,
fo,8
Total
191
1-11
3.3
3.2
(•(>
JL6.
Q.O
IS 0
99
lot.
;ertain
if
&s
//
1
/
lUt
//
m.
Number
Doubtful
? f
/
I
O
sp
1
14/
A/c
Total
/Of
-]&
111
15
H
(1
13
/Cfl
/ ?
at,
Numbei
Certain
z
£
3
2 .
0
if
1
!£.
JL
Doubtful
s

1A
2-5
/€•¥
2.8
C9.3
PeiCent
Doubtful
// o
15-
/. 5"
0.0
1-3
0.3
#£>
1-2
30-7
Total
72-0
/fi4
11.8
3-0
f-z
If. 4
4.0
119.
.£?& e E-j^r *£•/?
Number
Certain
0
i
_L
3
0
3
Doubtfu
2
S
/»
$
0
D
0
n
Total
/ /
/ /
;
3
o
ii
3
f a
Certain
O.O
l'tf-3
2M
2-4
ao
0.0
1-1
9-0
71-2
11
59.5
Pei Cent
Doubtful
H-8
tt.g
6,0
CO
0.0
o.p
0.0
£?•£>
0.0
¥o.S
Total
Lf-8
2Cl
Z 4
0,v
O.o
1.1
QO
77
109.
129

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.