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.
“Midwest”5 pages
Evaluation
0- Balloon
1-Astronomical
2-Aircraft
3-Light Phenom.
4-Birds
5-Clouds, Dust, etc.
&-tnsuffic .Info.
7-Psycho logical
8-Unknown
9-Ottier
Total
Ctrtain
110
47i-
264
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3ft
I,f9
l/l
2100
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Number
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24
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(3
0
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36
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7,1
16
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(41
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(4$
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e7
a 0
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(7
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(02
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£'3
2V°
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Number
Certain
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17
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-
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Total
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Evaluation
O-Balloon
1-Astronomical
2-Aircraft
3-Ligfit Pftenom.
4-Birds
5-Clouds, Dust, etc.
S-lnsuffic. Info.
7-Psychological
8-Unknowi
Wither
Total
AIL
2.1
0.9
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/ • $
tt-S
100.
/9
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O
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2.
0
0
•
740
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to
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Total
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(14
10
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3
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7
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7
Per Cent
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4 7
76
£J
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73. t
61
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, Total
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, 2
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Evaluation
0- Balloon
1-Astronomial
2-Aircratt
3-LigM Phenom.
4-Birds
5-Clouds. Dust, etc.
6-lnsuffic Info.
7-Psychological
8-Unknomi
9-OthEr
Total
/PS-0
Number
Certain
22,
42.
30
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0
2-i
2,
42
6
770
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0
0
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£
39
Total
27
to
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0
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0
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4.
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209
F
Certain
20-(
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(0
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5 3
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Total
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/
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Total
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24
3
/
0
/4
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f
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&,•<>
(9.3
/(• 7
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0.0
00
70.2-
07
277
ff.i
'er Cent
Doubtful
2.2
/O.2
e-n
O7
0 7
0.0
00
01
00
2l)4
Total
26.6
77•>
1.2
07
OO
/0 2
/•¥
777
/?$£
Number
:ertain
/££
21f
ZUL
2L
9
3
/£f
2b
344
S2
7214
Doubtful
7?O
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/ /
5
7
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o
4ft
Total
Zff
qo<i
/I
/O
(f9
n.
a
tin
Per Cent
Certain
JlL
JU_
0.4
to.o
2.0
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Doubtful
iJ
II5
1.0
0-3
oV
00
0-3
0.0
0.1
t i t
Total
111
Zot
ni
01
n
2o,<?
If
/oo
•
Number
Certain Doubtful Total
Pet C » t
CoUin Doubtlul Total
107 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.