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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.

Evaluation
0-Balloon
I-Astnowtal
?-Aiicraff
3-Li|M Prienoo.
4 - B i *
S-Clowh, Dust, etc
frhmffit Wb.
7-Psydnlofical
t-Uakaow
ToUl
Evaluation
0-Balloon
I-Astmnaical
7-Aircnfl
3 - L i i M P k a m .
4-Binb
S-Clouos. Oust, etc
S-limffic Wo.
7-Psvcholofical
(-UnknoM
W B l H
1 Total
Evaluation
0-Balloon
1-Astnnomical
2-Aircraft
3-Ligtil Phenoa.
«-Birds
S-Clouds, Dust, etc
6-lnsuffic mfo.
7-Psvcholo|ical
t-Unknoan
9-Olher
Total
Foe
J/}/UV/)/et/
Number
Certain
/
/
1 g.
0
2,
s-
?
Doubtful
0
^
0
f
Tobl
/
O
O
o
o
o
o
z.
/
o.o
260
Total
C-3
/2.$
12.$
3 '
3 /
O.O
£?.3
S. /
4S-7
3./
lOO-
/40A
;ertain
/
,
0
0
a
a
0
0
0
1-
Number
Doubtful
0
0
0
0
0
0
0
0
0
0
O
Total
/
/
O
O
O
O
O
O
O
O
•2.
J/SA
Number
Certain
?
0
O
.J2-
0
0
7
Doubtful
2,
/?
f?
0
0
0
(?
0
2
Total
f
s
0
a
0
0
0
7
2
ao
0.0
o-o
0.0
0.0
ao
0.0
0.0
/ao.
Percent
Certain
if-2.
is
O.O
CO
CO
0.0
0.0
tLL
Doubtful
0.0
a.o
a.o
0.0
\_ag_
O.O
O.o
O.O
o.O
ILL.
Total
?7JS
20.f
O.O
O.O
O.O
O.O
O.O
if.2
42
/oa.
/?c-r04£,e
Number
Certain
7
0
0
2
0
0
4/
0
/¥•
Doubtful
0
0
0
^
0
0
0
/
Total
/O
/
/
O
2 .
O
O
O
t/L
/f
Percent
Certain
0.0
O.O
/O.S
ao
00
0.0
2/./
o\o
Doubtful
/s.S
0.0
5-3
0.0
OS
0.0
0.0
0.0
ao
£3
2C. 3
Total
S-3
$.3
AO
/0.S
a.o
00
0.0
2//
f-1
/oo.
&y£ e 77*/*
A//9/et//
Number
:ert»n
/
/
0
0
0
0
0
/£>
O
/8
Doubtful
0
'0
S3
0
O
0
0
Total
7
r
0
0
0
a
0
O
/O
0
/S
PerCent
Certain
3R?
St>
O.O
O.O
O.O
ao
AO
ao
0.0
/ao.o
Doubtful
a. a
0.0
0.0
0.0
0.0
0.0
0.0
0.0
o.a
0.0
0.0
Total
S-4>
O.o
ff.O
a.o
o.a
0.0
O.B
ST.*.
0.0
/eo.
Joci/
Number
lertain
/4
/£•
/
0
/
/
£/
4
12.
Doubtful
f
/
0
0
0
2 - /
Total
2/
17
/f
O
O
z.
?2
PerCent
Certain
/4.3
/2.2
£I /
/•O
a.o
0.0
XI
/.O
4LL
7U
Doubtful
7- f
r.te.o
o.o
0.0
0.0
/•O
o.a
O.O
2/.if
Total
2/y
It 3
/if. 3
ft?
D.a
O.o
$2
f.0
3/.L
t/j
/CO.
As0v£/
PerCent
Certain
llf
/2.5
0.0
o.O
0.0
O.O
2S.0
O.O
2/.S
O.O
Doubtful
0.0
0.0
/2-S
6.0
0.0
0.0
0.0
0.0
0.O
00
/2.4
Total
117
/2S
/2.S
0.0
0.0
0.0
2SO
0.0
3/.g
a.o
/OO.
/?#/,&sr
Number
Certain
J
0
0
0
2
/£
/?
Doubtfu
J»
7
S
/
^
0
0
fR
Total
f
/.r
0
(7
Z
£
AT
if
Certain
/ / /
/4%
0.0
0.0
0.0
11
0.0
tt.r
PerCent
Dubtful
&£
/2. 1
(9
O-O
0.0
o.o
0.0
O.CD
?4
SS3
Total
/(..7
?7 7
l-f
0.0
0.0
3.7
1.7
/oo.
/?£
m
PerCent
Doubtful
DO
/ / • /
O.O
0.O
O.O
o-o
0.0
00
O-O
O.a
/ / • /
Total
O.O
22.2
O. a
O.o
o-o
a.o
ao
22.2.
</</.</
//./
/w
J
171
L,

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.