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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.

1
Enliiation
r> Balloon
I-Astionomial
2-Aucrartt
^Li^ht Ptitnom.
4-Birrts
S-Clouos, Dust, etc
6-lnsufiic kifo.
7-Psvcholo|ical
S-Unkttnm
»>Otner
Total
r A? 73
flu
fS-2
>er Cent
Doubtful
J2J2
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4?
4f
Total
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0
2.
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0
0
P
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Number
Doubttull
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2,
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0
0
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Total
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2.
2.
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0
y—0-
f
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2.
0
a
0
4
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0
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0
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Total
2
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0
0
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4
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22-
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9 A
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0.0
A $2.
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Number
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0
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70.0
Doubtful
4 0
10.0
0.0
0 0
0 0
0.0
0 0
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30-0
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4l9.0
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/£}, £
AfS2'
Number
Certain
A0
J
23
g
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Doubtful
f
7
0
0
/
Total
— ^
A0
9
A?
21
i ^
5 7
9
2O3
Percent
Certain
4.9
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ifi.l
2.0
2.0
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0.0
tf.O
.79
Doubtful
44
•f-Y
AA3
jr.O
2 ?
0.0
A-0
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2t, /
Total
7-2
7'/0/V 0F A//l/A7~ SA&A/7~/Al/C> S At9l? /*)i.L V^/fjf^ /&V
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Evaluation
0- Balloon
l-Astranormcal
2-Aircratt
3 - L I J H I Phenoa.
4- Buds
5-Clouds, Dust, etc
&-lnsuffic kifo.
7-PsycholO|icai
S-Urunmn
9-ODier
Total
* AIAC
. Number
Certain
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4
0
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12.
5
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0
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a.
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Total
2.
f
3
s
0
10
4
32.
19
Per Cent
Certain
A3
J 2
J.S
5/
0.0
/2-1
S.i
4P.S
i.3
$2.3
Doubtful
/•3
S~A
7-6
0.0
A-S
0.0
0.0
/.-?
0(?
A3
rr.7
Total
2. A,
(P.Z
If**1
6-4
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(2-7
4o.s
iff
Ceitain
0
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0
p
0
d?
0
A
5"
A

0.0
77
O.o
0.0
20$
77
MS.
77
(OIL-
Evaluation
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lAslronoaial
2-Aircratt
J-Litht Pneno*.
4-Bnds
S-Clouds, Dust, etc
6-lMuflic k b .
7-PjrdBloral
1-IHiDnii
Mow
Total
/9S-0
Number
Certain
0
7
a
A?
0
0
A
0
2.
Doubtful
0
£?
0
(7
0
o
0
_ £ _
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0
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0
0
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500
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a
0
0
0
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A?
2,
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4
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0
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0
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o
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Total
0
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0
0
/
0
/
0
2.
/
P e r c e n t
Certain
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0.O
0.0
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0.0
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20.0
Doubtful
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(?lP
ao
A?,0
20.0
0.0
0-0
0 0
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mo
Total
(?-0
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(?•(?
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0.0
ft>.o
ZO. 0
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A95-2,
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;ertain
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2.
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2.
0
0
20
&
Doubtful
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0
0
0
0
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L_ 0
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A0
ToUl
2,
i>
7
3
2
(?
40
00
3
47
Per Cent
Certain
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£.4
4.3
t.4
0.0
t.s
00
.C
IO0.
Number
Certain Doubtful ToUl
PerCenl
Certain Doubtful Total
148

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.