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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.

!
E n i u t i o n
:0- Balloon
I-Astronomical
2-AircraCt
3-L.|til Pnenon.
4-Birib
S-Cloods, Dust etc
•Vlnsuffic kilo.
7-Psyctaiojical
t-UnUnai
K)t»e>
Total
TOTAL —
Certain
24?
30
/J-
3
2l/0
-31.
rr
Numbet
Doubtful: Tout
/32
2£J\
/?
JJL
33?
¥7?
4-74
lf-T
22
?\ /o>
f
246
44-
# • &
/£?
Z/?9
Per Ceril
Certain
UL
12.1
JdL
0.5
AL
to. 9
1,6
tJl
JL1
72.1
Doublhil
£.0
9.3
rs0.1
OS
0.3
Total
2J.1
ZI.6
2.3-
1.0
o.l
&0\/p.9
&»\ Z.0
1.1
!M
'?,7
Zff
/OO.
Nunber
:ertain
5-4
JtL
£
X
112=.
/£
35S
Doubtful
Sf
7
2
3
0
2.
/
/£2
Total
/cf
12*
/0
ft?
f/2
'7
7&>WA/£ W/f/TS
Per Cent
Certain
IS
3JL
A?
v 1
0 ^~~
4L2.2
OJL
J.I
0.7
H.I
Doubtful
2.0
1.6
2.0
0.2
hi
Al
0.0
O.I
0.0
0,)
7.V
Total
is-
S:6
3.f
C.U-
0.3
0.2
2-2.
OS
sr-l
0.1
X3.S
AterAiu/i
Nuabet
>rt»n
-£L
_ 2
3
3
3f
76
21/
Doubtful
2.1
f
O
/
O
Total
/s
/?7
7
f
3?
7
76-
tf
J g 7
Pet Cent
Certain
2S
03
3.9
~oJ
0.1
0-1
1.7
O.U-
3S
u
13.1
Doubtful
1.3
24
02
o-f0.0
O.0
0.1
0.0
0-2
Iks'
Total
3,1
0,7
6.3
0.3
0.2
O.I
A7
OS
3S
0.3
17.7
C OU>R #or^ ^r^rtrx?
Nunber
Certain
1L
-JL
/
62-
02
26
Z24
Doubtful
/£
£>
/
0
(2
Total
U-0
2P
V?
0
r
/
62
3t
Percent
Certain
I.I
OS
A3
O.0
A 2
0.1
2.1
0.3
2,1
1.2
10.1
Doubtful
0.7
A 7
aoO.I
0-0
o.a0.0
0.0
0.2.
2,1
Tot*
J.V
of
2.0
0.0
0.3
01
03
2.?
/.if
12.3
Evaluation
O-Biloon
1-Astnaoucal
2-Airciaft
3-Li(ht Pixnot.
4-Binb
S-Clowls, Dust etc
6-lnjufIic fcfo.
?-PjydBtopal
B-Unknon
«t)»f
Total
Certain
/s~
-J£.
LL
/o
I
Numtw
Ooubtfull Total
22
/
_ £ _
2S-
«c
/r
2-
/ / i £?\/7
^3- tZZl
7
•4?
J6
fg\02)
Pet Cent
Certain
0.7
1.1
/ . /
CI
~c$
C2-
2.2
0.4
7.0
Doutttu
DS
I.I
1.0
0-0
0.0
^~o7
0.0
Total
f.Z
2.5
/.?
OS
0.2
OM
0.1
0.3
2.2
0.7
IT/o.l
/fez? Ptf UUlMVA /f£-£7
Numbn
Certain
A Z
/
O
0
IH
3
33>-
7
'35-
Ooubtful
?
/*
7-
/
0
s>
2-
Total
22
5 >
J6
/
rt3
33
r
Pet Coil
Certain
uJZi
1.0
O.f
0.0
0.O
0.?
0.1
63
6.1
Doubtful
0.U
0>.7
0>,6
O.I
0.0
0.1
ao
£>.O
0.0
a/
2.0
Total
/.D
2.Q
0-7-
0.0
O.I
0%
o.l
AS
a#
*mkm
:«tain
3
U3
7
2.
P
O
?
O
r/
Doubtful
0
SS
7
0
0
0
0
0
0
/
Total
3
/*
2
f
0
4-
PetCent
Certain
0.1
2A
0.3
Al
0\o
_&0
A6
M
111
Doubtful
AD
ZS
0.3
O.0
OX>
0.0
0.0
0.0
0.0
0.1
2,1
Total
0.1
AST
0.1
AO
ov
tv
O?0
0.6
0.2
(,s
L/G»r £ju>ni /CnuirJ/pr/ti/aivM
NoBbet y
Certain
2S
11.
U-
0
0
21
0
2J
/0%
Doobttu
Z
f
22
_?
/
/
0>
/
0
0>
Total
22
34-
40
/
/
2/
7
^ /
5-
152
P w C m t
Ccttaa
At
1,1
O.I
02
At
AH
AO
ao
1,0
0.7-
Doubtful
0.4
0.1/
1.0
0J
0./
(7.1
0.0
o.l
0.0
0.0
Total
/.D
JS
1,1
ft-3
0.1
O.f
1.0
0-1
1.0
0.2
If
t
Evaluation
0-Balloon
I-Astnnoarcal
I?-Aircraft
!3-Lit"t P t r n a .
4-Bifih
S-Clouds, Oust e«c
6-lnsuHic kite.
'-Psychological
tVUnknoM
^ t h e r
Total
Ntmixt
Certain
/ /
24
22-
5~
0
/a
2-
3J-
3
az.
Doubtfu
/
J~
/
2
U2.
Total
2-4-
3*
J£
6
-2.
/
^
3/
r
Pet Cent
Certain
0.7
AL
f.D
0.2
O.0
AE.
0JL
0.1
573
Doubtful
C.U
0.6
0.1
0.1
0./
0.0
01
0.0
0.1
•/.?
Total
/ . '
1.7
A 6
0?
0./
0.'
o.i
o-l
/.»
0.2
1.2
Nunbet
Cntain
3
2$

c?
0
0>
t
7
Percent
Certain
IJ
no
0,1
0.1
0.0
0.0
M6.0
0.1
O.D
0.2
Ombtful
ao
0,0
0.1
0.1
ao
0>.O
0,0
0.0
(20
0-0
fit
Total
0-/
0.0
0-2
0-2
0.C
0.0
0.0
0.0
t't
0.0
0.3
Evaluate*
0-BJlloon
lAstronoaical
2-Aircraft
3-LijW PnemL
4-Brrrb
5-Clouds, Dust, etc
6-lnuttic. k k .
7-Pirctolopol
S - l H n o w
S-OB*
T M
Vjoifrr t>/r (j/jnM/! i//oi-£r
Nraoet
Certain
0
__L
0
0
£l
LJL
/
c-
3
Ooubtful
0
c
f
0
f
0
0
0
Total
0>
/
0>
/
0
£>
O>
/
0>
T
PetCmt
Certain
AO
O.I
0.1
0.0
J2A
00
GO
0.0
0.1
0.0
Doubtful
0.0
OP
of
0.0
At
9.0
no
0.0
ao
0.0
o.i
Total
0-0
0.1
02
00
0.1
0.0
0.0
o.o
0>.l
0.1
O.Z
(j/.DW/^6 OtfAy
NlMKf
pertain
-10
0
0
0
0
0
_ / .
3
Doubtful
/
f
0
O
0
0
0
J-
Total
/
/
/
/
0
7/
S
Pet Cent
Certain
0.1
0.0
0-1
0.0
00
O-o
0.0
01
00
Doubtful
ao
t-I
ao
0./
0.0
0.0
#0
$0
0.0
0.0
0./
Total
O.(
0.f
0./
O.f
ao
00
0.0
fit
0.0
ax.
N u d w
;ert*n
*
•
Doubtful Total
Percent
Certain Doubtful Total
Nuabei
Certain Doubtful Total
Pet Cent
CertM Doubtful Total
143

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.