Documents / Report
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.
“R.G.”3 pages
Evaluation
0- Balloon
1-Astrommical
2-Aircraft
3-lighl Phenom.
4-Bnds
S-Clouds, Oust, etc
6-lnsuffic Info.
7-Psycnoloiiol
8-UnknoMi
9-Other
Total
• i9f>
'Sfc
Number
Certain
0
3
0
0
0
7
Doubtful
0>
/f
1
p
P
P
0
0
7/
Total
2-
3
/ 0
/
6
0
0
7
33
S Of,
Certain
0-0
/[.I
0,0
ft-/
0-0
i./
00
i/.z
0,1
U.7
> .//=•
'eiCent
Doubtful
0 /
0.0
/2. /
S0
/2 /
0.0
0-0
0-0
3?.J
(/AT//J
Total
07
3&3
J0
/f.2.
O.0
£•/
0.0
2/z
/00
A/
par
6-7P Set
Number
pertain
0
1
f
0
p
0
1
_A
M-
0
by
Doubtful
0
0}
0
3
/
0
0)
O
0
0
Total
0
/
5
3
1
0
1
0
/f-
0
7S~
$ &
10 A/I
Certain
0-0
&••?
0-0
0-0
0 7
0.0
0-0
ft!
/&/V7'/
'er Cent
Doubtful
0-0
0.0.
0.0
47.0
07
0.0
0-0
00
0-0
0.0)
2£-7
Total
0.0
t-7
??3
24.0
£.7
0.0
(-•7
2i-7
0.0
'00.
S/6,•/TV* 6 ?£•
//~J0 S ££/>/*C5
Number
>rtain
0
0
70
0
7
o>
0
0
7
0
/ /
Doubtful
Z-
/
3
7
P
0
0>
/
0>
P
/
Total
/
73
/
/
/
7
p
F
Certain
00
00
tf.6
00
S-t
00
00
209
i-f.2,
eiCent
Doubtful
77
f.$
2if
0-O
ti>0,
rc
3/-fe
A
-A/
^ C
Number
Certain
o.
u
7
P
7
p
•0
0
s
0
73
Doubtful
P
7
7
/
/
o?
0
C
•£7-
Total
• 0
/
I
0)
0
0)
s~
p
77
Per Cent
Certain
0.0
0.0
4/.2
0.0
£.9
0.0
00
C0.C?
29.7
0.0
Doubtful
0.0
• - J~~/\7'/A'£/r£-
0
/
O
c
/f.
Total
3
P
7
3-1
2-
Per Cent
Certain
/.&
0.0
/*/
/i.
00
/'•3
0.0
SI 9
J.2.
7/-0
Doubtfu
¥1
/t,. /
0-0
0-0
00
/•fi
0-0
00
21o
Total
7.V
3S.6
(9-P
/.i
3f.f
J2>
/00-
6 -301 /h//A/07~£c;
Numbei
Certain
0)
AL
7
it
Doubtful
3
0
/f
7
0
0
Z-3
Total
6
£3
/
P
/0
P
/r
Per Cent
Certain
0.0
,2.9
3.1
0.0
0.0
/k/
0.0
2^.1
023
Doubtful
0.0
f.t
/•t>
0.0
0-0
0-0
0.0
J.Z
$7./
Total
i t
*77
/ 4/
0.0
//t/
00
27.1
tff
/0O.
P \Z£ff %£> M/A///7-£-i
Number
Certain
6
JL
/
0
0)
•ty-0
Doubtful
O
J-
/
0
0
0
0)
• /
7
Total
6
7
j_
0
0
g_
/
^7
Percent
Certain
/ / . /
2-7
00
00
0.0
4.2
5?-Z
Doubtful
00
V.2-
0.0
07
0.0
/ • /
00
00
9.0
Total
«•?
2JJ
/ /
sz
0.0
2/J
2.1
/V.7
/OO.
.aA
Evaluation
0-Balloon '
1-Astronomical
2-Aircraft
3-Ligtit Phenom.
••Birds
5-Clouds, Dust etc
6-lnsuffic. Info.
7-Psychological
B-Unknoon
Mtliei
Total
Number
Certain
' 0
07
J_
0
0
' o
J
0
7
Doubtful
0
/
2-
0
0
0
c
0
3
Total
0
/
?•
o
C
0
3
• 0
.?
0
/o
PerCent
Certain
/CD
_M
6.0
J l
30.C
0.C
3^
0,9
70.$
Doubtfu
0.0
ft.O
&w0.0
00
0.0
0.0
0.0
oe•0.0
30.0
Total
0.0
/fit
?/>.
0
2.
Doubtful
/
0>
7?
0>
£>
0?
P
0
0>
/
Total
/
0
/
0
/
P
7?
0
p
p
3
Per Cent
Certain
0.9
33.3
O.O
33.3
O.C
O.D
M
M.
Ad
6J1
Doubtful
333
ao0.0
p.o
0.0
0.0
O.[)
fift
00
33-3
Total
333
0.0
333
0L
333
0.0
00
OJ
0.0
o.o
/oa
7/--3/0 SjFCff/y/Ps
Number
Certain
0
0
0
00
$
o1
0
0
00
Doubtful
0>
/
P
0
/
V
p.
/
0>
0>
s
Total
7
70
£
0?
7
oo
3
Per Cent
Certain
M.
o.o
D.O
JJL
A l
0-0
0,0
0,0
o.o
Ai
Doubtful
33.3
t>.r-
D.O
3-3.3\
tt.o
0.0
33.3
0-£
0.0
mo>
Total
0
33.3
00
ao
0,0
£o
do
700.
jf/Y/O See/> A/as
Number
Certain
/7-
0?
0>
0>
Doubtful
P
0
P
£>
o
0
o1
00'
Total
0
7
t>:
4*
0
O
&
3
00
f
Per Cent
Certain
AO
72.Z
0.0
S-/J.0
-M
o.o
0.0
700.0
Doubtful
•AO
0.0
' 0.0
0.0
o.p
0.0
0,9
0.0
MO
o>.p
Total
0>,O
0.0
7Z5
00
P-0
O.p
00.0
Its
0.0
y.
Evaluation
0- Balloon
1-Astronomical
2-Aucraft
3-Li{ht Phenom.
4-Birds
S-Clouds, Dust, etc
G-lnsuttic. Inh.
7-PsycholOEial
t-Unknoon
9-Ottier
Total
i/ See.OA,os - 5~Miwi/res
Numbei
Certain
0
0>
0
0
7
0
IT
Doubtful
• o
7
/)
/?
r
r
ft
(7
r
?
Total
/
(?
/
0
p
•if-
?
/ /
PerCent
Certain
O.O
JA
AIL
O.O
SL
-M
O.P
Ulh
za
Doubtful Total
to ao
o.o
0-D
9-1
£.0
9,1
07)\ 00
0.7\ dC
o.o\ ao
0.0
-££
27,3
3£if-
ffl
10k
0- 30 M//VVr-£S
Number
Certain
/
0
0
_ ^
_L
0
_J
_A
Doubtful
0
7
P
0
P
&
0
7
Total
J
/
77
2~
0
/
0
J
0
r
Per Cent
Certain
/ZS
At
0-0
^01
fJLS
o.o
Doubtful
40
0.0
0-0
. o.o0.0
0.0
00
O>.o
00
7J.S
Total
as
VXf
0.0
01
0.0
fas
0.0
00
/to,
Number
Certain
0
o
_±O>
7
2£
0
Doubtful
0
0
7
07
0
0
P
P
P
/
7.
Total
&
7
7
&
&
P
./
/
Per Cent
Certain
A6
MO
/?./;
3.3
j A
u1.2
00
U3
Doubtful
0-0
0,0
3.3
0,0
00
0.0
0.0
00
•0.0
33
Total
'33
3.3
0.0
0.0
0.0
S3
&7
33
700
7?0£/9770/U Pj0f ST/)T£P
Numbei
Certain
~A7
0
0>
uZ
U2.
7
Doubtful
P
07
/
P
0
P
•0
P
P
P
/
Total
0
/
7
70
0-
0-
7
i
^ -
Per Cent
CetUin
_ ^ 2 .
4f
00
0.0
/).O
00
s/.s
9./
V0?
9./
Doubtful
<?-0
00
0-0
ao
0-0
00
0.0
0.0
0.0
Total
0-0
fro
m9./
Y0-9
?•'
/0O.
233 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.