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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.

E n l n t x w
0- Balloon
1-Aitmnonrcal
2-Aircrart
3-LigM Plwnoci.
4-Birds
5-Clmts, Dust, etc
t-insuffic kilo.
7-Psycho logical
S-IMmoMi
cottier
Total
Evaluation
O-Bailoon
1-Astnmmical
2-Aircnft
3-Light Plienoai.
4-Birds
S-Clouds, Dust, etc
6*lnsuffic Info.
7-PsvcnorO(ical
cVUnkmwi
Wither
I Total
Evaluation
D-Balloon
1-Astlonoaical
2-Aircraft
3-Lijhl Ptienm.
4-Birds
S-ClotKls, Dust, etc
6-lnsuffic kifo.
7-Psvchok>(ical
8-Unknown
Winer
Total
fit
Number
Ceitain
/
3
2,
/
s
y
Doubtful
/
a
0
0
0
Z
Total
2
3
3
/?
0
0
3
/
/j
Certain
7,1
231
/S-4
0.0
o.o
a.o
71
0.0
22/
77
Hi
Percent
Doubtful
7-7
d.O
77
AO
0.0
O.O
0.0
o.o
6.0
6-0
&4
Total
2U_
O.O
0.O
77
o.o
22/
77
(OO.
M/W
Number
Certain
_ ^ _
0.
0-
0
0.
3
Ooubrtu
0
a
0
0
/0
Total
/ /
z
0
o
0
0
7
3
37
Percent
Certain
24.J
o.o
/0.S
O.O
0.0
o.o
(0.1
o.o
(tit
X.I
7~30
Doubtfu
(LZ
CO
oo
O.o
i.O
o.o
o.o
o.o
21.0
Total
29.7
.?•?
2U
ao
0.0
o.O
/of
0.0
(I?
/0O.
f£/>r£/i*/l££
Number
Certain
3
y
0
0
,7
0
0
23
Doubtfu
0
0
0
0
0
0
23
Total
it
0
f
//t
4i
P a Cent
Ceitain
21
4-3
0.O
0.0
O-d
2-2
O.O
3¥.%
O£>
eoo
Doubtful
/J.0
2.Z
Hi
O.o
O.O
O.O
d.0
O.O
Od
0.0
50-0
Total
ft*
3%/
ao
a.a
0.0
2.2
ao
Ht
AO
IPO-
94/r* f
Number
Certain
/
0
2.
0
0
/Z
0

U-
(.2
i l l
UL
1U-
Doubtful
a.o
0.0
// 7
00
0.0
O.O
0-0
O.O
/i-7
333
Percent
Doubtful
u
It
ft
0.C
AO
d.O
0.0
/ • $
0.0
0.0
22.7
Total
/ / • /
d.0
SS.5
ao
0.0
£•£
// /
4-7
/oo.
Total
t i l
!•/
43
ao
g.t
if
/O0-
A*#£/e
PerCent
Certain
IJJ-
£1
0.0
^1-
d.o
no.
0.0
0.0
2LZ-
0.0
53-3
Doubtful
OO
/ /
ao
a.o
ao
M#
0.0
0.0
00
0.0
41-7
Total
(33
/ ? /
O.o
(,-7
0.0
V0.o
/0.C
a-6
?L-7
0.0
/oo.
Certain
2\j
y
/
a
&
/
/2
y
3/
70
A
Numbet
Doubtful
0
2
0
0
0)
0
0-
3
if/e/<.
Total
2.
2.
0
/
<9
/
/£•
/
J 7 /
'£ / *f/A/l/7
Percent
Certain
29
~Jj\
0.O
/Y--7
UL
JO
Doubtful
0.O
2~ 9
0.?
d.o
0.O
00
ao
a.o
0.0
0.0
fg
Total
£ £
Zf.Y
00
O.o
(¥7
2.9
3Z.3
2.9
/Pi/60 rr
Nu«bH
Certain
/0
/
/Z
0
0
0
3
£
23
2
&3
Doubtfu
/2-
y
f
0
yy
/
tP
0
2(
Total
99
2.
p
3
23
2.
74
PerCent
Certain
/4
O.O
OO
-2U-
3A/
1/i.
DooWfal
/si
4./0.0
0 0
0.0
(•4
a-o
d.O
2f</
Total
2f7
2$
2/.C.
4/
0.0
O.o
4'
47
s/./
7.7
/00
/?£'<!£rt/S£<G.
Number
Certain
5"
/
0
2
Doubtfu
/
/ •
0
0
0
0
0
a
7
Total
i
(,
0
0
2
0
&
0
23
Certain
2/-7
f7
¥•3
O-O
00
OO
f-7
0.O
?(•/
ao
Percent
Doubtful
43
2(7
a.o
6.0
0.0
o.o
d.o
a.o
0.0
/0V
Total
2LO
/JO
2L.O
O.O
O.O
O-O
f-7
0.0
26./
0.0
/w-
169

Cases discussed

About this file

Report, cited by the archive. The PDF is mirrored here; the original link is above. 309 pages are in the text index: search them above, or from the library's search.