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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.

A if of
Evaluation
0/Balloon
l-Astromaical
2-Aircrltt
3-Ligtit Ptienon.
(•Buds
5-Cloud*. Dust, etc
Hnsuflic. kilo.
7-Psrdnloral
t - I M n o m
Wtoe
Total
Number
Certain Doubtful
•
Tout
, ^
Percent
Certain
S:
Doubtful. Total
; i
\
1
Number
Certain Doubtful Total
\AN
Per Cent
Certain
V
Doubltul
>
i
Total
Numtm
Certain Doubtful _Total,
i
Pet Cent
Certain Doubtful
>>
\ N
Total
Numbet
Certain Doubtful Total
M
Pei Cent
Certain
/
Doubtful
V
Tom
i Evaluation
0-Balloon
•.-Astronomical
!?-Ait«att
,'3-Ligrit Pfienon.
4-Biids '
:S-Clouo\ Dust, etc.
'e-lnsuftic Info.
;;-Psvdiolo|ical
t-Unknoin
W}Uier
Total
Evaluation
0-Balloon
1-Astronoraical
2-Airaatt
3 - L i | M Phenoca.
4-Binh
S-Cloods, D m . t i c
S-lnsuNic W o .
7-Psytholoiical
t-Unkmnm
W t h e r
Total
A/Ay
Certain
Certain
0
1
0
—6
0
0
1
1
2
0
S
Number
Doubtful
\
Total
T \
Certain
Percent
Doubtful
\
Number
Doubtfu
•Q
0
_0>
0
a
0
0
Q
D
0
0
Total
0
1
0
0
0
0
1
1
J
0
s
Certain
00
7 O.O
0 0
0.1
0-1
0.0
to: o
G.j
) ate
Percent
Doubtfu
0-t
o.c
Iff
f.0
9.9
90
(?•(>
O.o
0.0
O.Q
0-O
Total
Total
0-9
1Q.0
00
0 9
0.0
O.Q
20 0
190
Hb
O.O
100
J~UA/£-
Number
Certam
/
0
2
0
0
3
1
n
1
n
Doubtful
0
1
0
0
0
Q\
Q_
.0
0
0
1
Total
/
/
7
0
o
o
3
;
H
1
/ 3
Number
Certain
0
1
6
0
0
0
1
0
H
Doubtful
0
2
0
0
0
0
0
0
- 0
0
T
Total
0
3
0
0
0
0
0
1
2
0
0
Percent
Certain
7.7
0.0
if4
a
MJ
CO
33)
7 7
US'
7-7
W3
Doubtful
0 0
7-7
0.0
Q.O
o.o
OX
o.p
O.0
0.0
o.O
77
Total
7-7
71
fS.if
O.D
t>.0
Co
23.1
77
JP.g
7 7
/to.
P a Cent
Certain
0-0
I&-J
0.0
9-9
MJ
0.0
o.o
IL-1
33.3
0.9
ui
Doubtful
0-0
33.1
O.O
o.O
0-0
0.0
0.0
C.9
333
Total
90
SO 9
0-0
0.0
0.0
o.o
0 0
••33.3
9-0
loo
Number
;ettain
1.
0
1
0
0
(,
0
g
10
3~i
Doubtful
0
3
2
0
0
0
^2.
. 7
0
0
7
Total
£
5
1
0
0
c
1
9
/0
HO
Certain
is.*
5.0
0.9
-7.6
Q-l
o.o
15.0
O.o
tQ.O
75.0
PeiCent
Doubtful
0J
l.S
r.p
o.o
0.0
0.0
Q.O
s.o
(0,0
Q.O
./7-S
Total
ISO
n-i
5.0
5.5
Q.O
o.o
li±
5-"
7.0.0
2S.0
/go.
Nuaber
Certain
Q
1
0
1
0
o
0
o
0
Doubtful
f?
/
0
0
0
0
0
p
1
Total
6
a
0
1
p
Q
(?
0
3
P a Cent
Certain
0 9
33.3
o.o
W5
00
CD
0.0
0.0
U-7
Doubtful
0.0
33.3
0.0
OQ
0.0
0-0
0-0
ao
{?•(?
33.3
Total
O-i
db.i
ao
323
0.0
00
00
-&&
0,0
/to.
/4c/<i Us7~
NunibH
Certain
6
1
(1
0
(1
2
a6
0
1
Doubtful
0
1
0
0
0
0
0
0
0
0
1
Total
0
•x
0
0
0
7
0
c
0
10
Certain
60
10 0
(1-0
0-b
6,0
00
loo
0.0
CQ.O
o.o
ft.fi
'eicml
Dojbttul
0.0
HO
0,0
0,0
/If)
0.0
M
0-0
9-1
19.0
Total
0.0
70.9
0./)
OB
fir
to
st.e
o.ff
Ct.o
t 0
ICO.
Number
Certain
0
JL
0
0
0
0
(7
0
0
0
7
Doubtful
0
0
0
0
a
, o
a
c
Q_
0
0
Total
0
7
0
0
o
0
0
o
X
•
Certain
0.6
1 00 J;
()•<!
0-9
CO
0.0
Q.0
to
100.0
Percent
Doubtful
0-t
0.0
04
O.o
ao
0.0
0.0
0,0
0-0
O.D
Total
00
If 0.0
9.1
0.0
0.0
0.0
0.1)
o.o
(1.0
Ito.
124

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.