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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
O-Balloon
l-Astronomical
2-Aucraft
3-Light Phenoni.
4-Birds
5-Clouds, Dust, etc
6-lnsuffic Info.
7-Psvctolo|ial
eVUnknom
9-Other
Total
Evaluation
O-Balloon
1-Astranomical
2-Aircraft
3-Ltght Phenom.
4-Birds
5-Clouds, Dust, etc
6-lnsuffic. Info.
7-Psychological
8-Unknonn
9-0 tiler
Total
-T/>jg(. - £ • ;
?£?£>
ALL YESRS
Number
Certain
_ ^ >
•J"?
/O
0
J
'
73
/3/S
YFA/T'S
Per Cent
Certain
/ ,
IJLi.
1.3
o.d.
0.'
£L3j
UA
£o_
717
Doubtfu
4-2
/A J
3 7
a.9
0.2
0O
/ 4
AS. 3
Total
/£-£.
h »'
j 2
/ o
/££.
/1
/T(f
f4
/g0
s
\/ foe

>er Cent
Doubtful
O.O
o.o
O.O
o.o
0.0
O.O
o.o
o.o
o.o
o.o
O.o
Total
/fiC.O
O.O
0.O
O-O
-&°_eo
a.o
/DO.
/9 J-/
Certain
0
_J_\
0
O
0
o
/
0
/
//try
Number
Doubtful
O
3
o
0
O
, o
o
o
o
o
3
0/V
Total
0
c
0
o
o
/
£>
,2
;
'ft
Number
Certain
1
/
0
0
;/
JL
So
Doubtful
0
0
o
0
o
0
0
c?
o
Total
/
1
c
o
//
lo
fa.
Percent
Certain
&£-.
.e
_0O\
0.O
0.0
/o o
0.0
fo.0
2*60.
/i
Certain
JdL
J0
£$-
O.0
&£-
A2.L
3.S
7.7
9Lx
Doubtful
0.0
Ao.o
O.o
0.O
o.o
o.o
@ &
& &
0.0
0.O
3o.o
PerCent
Doubtful
e>.o
U
0 O
o.o
o.o
o.o
O.O
O.O
o.o
o.o
u
Total
£>o
io.o
O.o
O.o
0.0
/0o
O.o
J0.O
/OO
/OO.
S~/6
Total
3-t
4oi
/.a
/ • *
0.O
o.o
3/./
3.9
1.7
/OO.
'&0t >K£
/94-t
Number
Certain
0
0
0
0
o
3
o
a
Doubtful
O
7
o
O
o
0
o
0
O
7
Total
0
/3
0
6
e>
0
-0
o
j
o
/£
Per Cent
Certain
o.t
O,t
0.O
•s.o
O.O
o.o
0.O
/f.1
0.O
Doubtful
O.O
43,9
0 O
a.o
OO
o.o
o.o
O.o
0.0
0.O
4i.$
Total
O.O
gu
0.0
J.O
0 o
O.O
o.o
0.0
/in
0.0
/
/? J~A
Number
Certain
0
36,
So
£>
/
t
0
3
#0
//r/
Doubtful
0
/
6
0
/
0
0
/s
Total
3
/A
e
I
ci
(
if
Per Cent
Certain
i>.0
fen
/O.i
Oo
o.o
/o
S.2
p o
A24
j . l
A
Doubtful
11
J.o
/•o
o.o
/•O
O.O
ff.O
/S.4
/?LL
'0r
Total
4 1
41,1
o.o
/•o
/o
/0
0.0
fi-o
e.o
*.
/ / /
f't
*}•?
•erCent
Doubtful
3-4
4.o
7-4.
O.O
O.O
OO
0.0
0.0
0.0
/ • *
/£•'
Total
/Of
/9-r
O.o
\-&£-
O.O
2J.1
O.O
/It
4o
/OO.
f?j~/
Number
Certain
/
0
0
/
3
Doubtful
£
4
z
0
o
£?
o
o
/7
jrotaTJ
4'
14
10
1
p
/Z
1
AC
3
74-
Certain
21
Si
/ • /
0.O
0.0
/(•A.
/ 4
&-. 1
4-1
77-0
aer Cent
Doubtful
/o.s
J'4
l
Total
93
/£4-
/£°
A4
s
4
/o
/4A
40
7J4
Certain
1-A
/Ll
0.7
o./
Ao
It I
3-i'
1/-9
>er Cent
Doubtful
fA
(2,f
/•A
0.4
o£
o.o
0.4
0.0
/ • ?
All
Total
/A 6
2 j i
J/X
,f-A
/•I
/J./
/•4
/tz
^4
(00.
Number
Certain Doubtful Total
t
Certain
'er Cent
Doubtful Total
203

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.