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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
f> Balloon
,1-Astronomical
2-Aiiaaft
J-lijM PTieran.
4-Bucs
S-Clouds, Dust, etc
S-lnsutlic Wb.
7-Psycnolofiol
Hjnknovm
»OOie>
Total
Evaluation
O-Bailoon
l-Astmnomical
2-Aircrift
3-Li|ht Phenon.
4-Birds
S-Clouds, Oust, etc
S-lnmffic Into.
7-Psvchological
8-Unkjw*n
5-Other
To*
Evaluation
O-Balloon
1-Astrtnomical
2-Aircrltt
3-Li jtit Ptienm.
•-Buds
5-Clouds, Oust, etc
6-lnsufiic. kto.
7-Psychological
HJnknow
Mther
Tot*
£xl£i-L £AJT
Number
Certain
7
if-
O
o
0
u-
6
1
w
•f/f/}{_
Doubtful
7
1
0
0
0
0
o
0
Total
If
0
o
0
u-
p
f-l
I
Numbn
Certain
/
3
.7
0
e>
0
0
n
7
IT
Doutlttu
0
1
0
0
0
0
0
0
0
3
Total
/
r
k-
Q
0
a
P
P
7
•J
18
.?/
i
Certain
itt.3
IX
-HL
8.2
0.0
ZO
13.7
CL£ /
'erCent
Doubtful
0,0
IU.3
2.0
0.0
0.0
0-0
r 0.O
0.0 \
O.O
ii.3
z
u-r
ToUl
f-2
MLl
0.0
00
_ £ £
ft
Jtid.
Pets
Percent
Certain
*5
n.7
re. 7
0.0
o.c
O.o
o,o
_ £ £
13.3
Doubtfu
o.n
11./
o.o
0 t
0,0
0.0
0.0
D.n
ti.l
Total
-J3L
ZzS.
0,0
-JLt
0,0
CO
£££
T,f
M,
Otffi
£x££LLE/vr
Number
Certain
n
17
2-7
Z
0
0
u
0
ho
7
ix8
Doubtfu
f
0
1)
0
0
0
0
o
Total
?s~
H3
X
0
o
a
to
7
It 3
Pel Cent
Certain
t.7
/4V
11,1,
1.2
0.0
0,0
3£A.
Doubtful
(•7
H.I
0.0
OP
0 0
0.0
oo
CO
2IS
Total
/•».//
I.X
0,0
0,0
0t
J(,fl
100.
~) &0O
Number
:eiom
3
p
o
o
1
*3
t//9r
Doubtful
D
ff
r
.. o.
o
0
0
0
0
J
li
'0/1/
Total
3
II
o
0
1
0
IX
51
#/:
O
1
Certain
T.I
10.2
o,0
0,0
0.0
11
CO
1,7
7xn
'?£•/
erCent
Doubtful
0.0
I3.t
fS
CO
0-0
o.o
o.o
0.0
CO
27.1
/?£•*-
Total
S.I
47.5
n 7
0.Q
>.o
0,9
1.7
0,0
6,?
110.
6 oat)
Number
Certain
s~
/3
7
0
0
0
0
_2_
3H
Doubtful
1
r
0
0
r
D
0
0
0
0
7
Total
7
0
0
0
f
0
/}
Per Cent
Certain
IXX
31.7
17.1
0.0
0.0
0.0
0.0
O.O
XL?
a.o
rx.1
'SZ.
Doubtful
XV
IX.X
CO
0.0
0.0
0.0
0,0
00
III
Total
/44
to-3.1
17,1
CO
_ 2 i f
CD
o-O
0.0
0,0
/OO.
Number
Certain
77
110
7
f
2 1
31
5~7I
Doubtful
sz
a
gj
L
10
0
Q
0
c
?xi
ToUl
1X1
UO
IS~
r
i?
- 2 J 2 - ,
2,
37
y7-z
Certain
%7
n?
10. 3
fi,1
O.T
i.O
a 9
?r.f
} • !
7ZI
P a Cent
Doubtful
(,i
6.3
II.1
1.0
O.I
1.3
0.0
CO
nfi
17.1
Total
111
70, X
72, X
-L3-
p,(,
O.3
Xl,l
*f, 7
5/6//7//I/6S
Number
Certain
12
17
0
0
_J2_
xr
0
3
97
tuc/.
Doubtful
£f
o
0
0
Q
O
O
I).
?•(
Total
X-P
-M-
0
0
0
0
7
l?3
/ f/£>*
Per Cent
Certain
13.1
0.0
0.0
CO
JUL
.17,1
113.
Doubtful
A /
7.3
O.B
o.e_
o.o
JP-IL
0.0
OJi.
2.7.
2-1.1
ToUl
'1,7
IU
0,0
0,0
0,P
S,b
/oo.
Number ^
Certain
X
3
2
o
0
9
1
U
•%
//,3
K.I
0.0
0,0
I*
If 3.1
3.(4
lit.
Percent
Certain
%0
111.2.
hi
JJJJ.
-2J_
3.5
71. £
Doubtful
7,S
I3 0
1,2.
0,tf-
0,0
0.F
6,0
0.3
2ff,H
Total
is:?
lf,0
ZXL
1.3
0,1
10.3
3.B
loo,
jt /A/a 74V
(.0
v-&A
//,(
to
H,6
100.
'. /A/3/i- /r</ .
/bo*
ToUl
S~f
e~)
3
D
11
-LZ.
21<£
Certain
I7,t
f,f
y.f
1.7
0,7
0.0
-20&
If, 7
CO
71,6
PerCent
Doubtful
7,1
7 It
CO
0.3
0.0
0,0
t,l
JUL.
2g.lt
Total
MuJL
1.0
o.o
3-0.0
34
JLL
(00^.
1 3 1

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.