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Project Blue Book Special Report (second copy)

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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
2-Airctaft
3-Lijtit Phenom.
4-B.rds
S-Clouds, Dust, etc
6-lnsuffic Info.
7-Psjcrolotical
t-Unkimm
Mttlef
Total
Certain
89
4/
+0
4
//
79
/s
iZ?S
Au
Numbtr
Doubtful
SI
35
/q
3
o
i0
t
o
7
IZO
Total
in
7^
if 9
7
0
10
IB
'A
7?
1Q
4/t>
Ys»f
Certain
J/4
9-9
7-0
It
fio
-&£
*?/,
/4o
J.I
HA
V
rs
'erCent
Doubtful
/J.3
7.4
4.1,
0.7
0,0
/4
o.o
O.X
0.0
/•7
zf,S
?££O
Total
33-1
I7.X
J^L
0o
A 4
4-z
ZS
/9 o
48
/oo.
s
Number
Certain
O
0
o
o
0
o
0
0
o
o
0
Doubtful
0
A
o
o
o
a
a
o
e>
a
3,
Total
0
X
0
0
0
0
0
o
d
0
p.
41
Certain
fi.0
O,o
oo
o,o
0,0
o.o
J2J2.
O.O
O.O
O.9
>er Cent
Doubtful
0.0j
/OO.O
O.O
0,0
o.o
Oo
o.o
O.O
o.o
O.O
/O0.O
1
Total
O.O
/eo.»
o.o
o.o
o.o
o.o
o.o
O.o
O.O
0.O
/oo.
srsr/oa//?*.
O
O
0
O
O
O
0
O
A
a
Total
s
0
0
0
0
.2.
3
J2.
fo Per Cent
Certain
3LA-
0.0
0.0
0.0
0.0
9,-t
/3(»
JJ.
0.0
4o1
Doubtful
O.O
O.O
O.O
O.O
O. O
O.O
O.O
O.O
91
1-1
Total
3i4
JZ.7
0.0
0.0
0.0
0.0
9./
/3 C
?•/
9-1
/oo.
/ f*r/
Number
Certain
-4.
/0
0
0
j -
0
n
Doubtful
' O
3
/
0
. 0
0
a
0
0
0
Total
Y
S
*.
0
Q
0
1
0
0
/7
Per Cent
Certain
A3J
/ / • !
f.4
O.o
a.O
j - $
0.0
0.0
7U
Doubtful
O.O
I7M
S.9
0.0
GO
0,0
04
0.0
00
Total
Z94
//£_
0.0
0,0
0.0
-£$.
0.0
#4
0. O
/9i~2
Number
Certain
4-
0
_ ^
7
/A
Doubtful
J~O
7 7
0
C
e>
/
0
4
Total
/nIfO
7
0
JO
11
$
TO
1U
337
PerCent
Certain
2/1
(••?
i.o
1.2
0.0
2.1
SoS
3.(>
7O.6,
Doubtful
/4.i
£3
f.o
01
0.0
/ • /
0.0
0.3
0.0
/•4
Jo,i
41
/oo.
Number
Certain Doubtfu Total
P n C e n t
Certain Doubtful Total
/?tl ir/0, 1/ £/6>,vr/A /C /9u. f i /If
_ .
Evaluation
0-Balloon
1-Astronomical
2-Aitcratt
3-LigM Ptienoni.
4-Birds
S-Clouds, Dust, etc
t-lnsuffic Info.
7-Psycholo|ical
B-UnknoMi
9-Other
Total
Certain
49

0
0
Total
/
a
0
0
0
0
c0
1
Per Cant
Certain
a#
0~.o
0.0
fio
O.O
0.O
O.e
0.0
SO*
I0&I)
Doubtful
0.0
O.O
O.O
O.o
_oo_
0.0
0.0
0.0
0.0
0.0
0.0
Total
Jle.p
0,0
0.0
O.o
0.0
Oo
O(?
0.0
SO. I)
/0O
/
O
0
O
O
J
n
Total
10
12
7
0
0
0
1
0
I
I
Certain
J7,6
tu
3.4-
0,0
ftp
0.0
34
tPO
JA
0.0
PerCent
Doubtful
J4-I
0.0
0.0
0.0
0.0
0.0
0.0
/o,3
44.1
Total
41.3
09
O.O
0,O
3.4
O.Q
3,4
//?•}
/oo.
Number
Certain
/
&
O
0
/
0
J
/
'H
Doubtfu
4
4'
0.
O
O
O
O
a
a
If
Total
5
/3
a
0
0
0
1
0
5
/
Certain
4,0
ix.o
0.0
0.0
0/7
O.O
4.O
0£>
/Zo
4,o
Sl.o
3er Cent
Doubtful
/I.o
lo.o
to
0.0
0 O
0,0
0.0
0.0
0.0
0,0
44.0
Total
JO. 6
J'ZO
to
0.0
0.0
OJ>.
4,O
O.O
4,O
/OO,
Evaluation
0-Balloon
1- Astronomical
2-Airuaft
3-Lijtit Phenorn.
4-Birds
S-Clouds, Dust, etc
S-lnwftic Into.
7-Ptycnok>|ical
t-Unknonn
t-Otlwi
Total
Nunber
Certain
sT
/
O
O
/
^>
/4
/
Doubtful
/
O
O
O
O
O
£>
O
O
O
1
Total
(,
1
0
0
0
0
1
0
1
Per Cent
Certain
JU
3.4-
Jo.1
0.0
0.0
0.0
34
0.0
34
Doubtful
34
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
34
Total
1o.£
JA
Ao.l
0.0
0.0
0.0
J4
0.0
tn
34
/oo.
Nunber
Certain
J
O
/
O
O
O
O
O
O
H-
Doubtful

/
O
O
O
O
O
O
O
O
I
Total
/
/
*
0
0
0
0
0
0
Per Cent
Certain
JOO
0.O
Xi.o
0.o
O.o
0.0
0.0
O.o
4o.o
O.o
80.0
Doubtful
O.O
Jo.o
O.O
O.O
O.O
O.fi
00
O.O
O.O
AO.O
Total
<&£.
XO.O
1'.9
O.p
O.O
O.o
O.O
f.o
4o.o
O.Q
/oo.
Number
Certain
IS
_ 1
M
0
cT
- T
4-
Doubtful
2.3
J
#0
S
I
A
0
a
1
Total
ire
11
3?
1
1
7
S
1
11
t
Per Cent
Certain
J0.I
xs
7.3
0.0
2.1
3.o
3.o
/A
/?.1
3.O
\ML
Doubtful
/4-o
4.1
/J.A
/t
o.&
/.z
0.0
0.0
0.0
o.b
3f.f
Total
/o,4
/9,r
/,f
M
42
So
h
mMr
/CO.
Kumber
Certain Doubtful Total
PerCent
Certain Doubtful Total
201

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.