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Project Blue Book Special Report (second copy)

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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
; Evaluation
0-Balloon
I-Asfonomical
2-Auccalt
3-ligtU Phmon.
4-Bnds
5-Clouds, Dust, etc.
6-lnsuffic Into.
7-Psyctalogical
B-Unhwwi
Withe.
Total
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17
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pp
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4-3
13.0
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77
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77
77
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1-Ast/ononical
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3-Uigfit Phenom.
4-Ditds
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6-lnsuffic. Info.
7-Psychological
8-Unknovm
Mttier
Total
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Number
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13.1
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r
r' "i Evaluation
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l-Astfanonical
Z-Auci.lft
3-Light Phefiom.
4-Bird
5-CIOUOJ. .-st, etc
6-lnsjKic. lr.t«.
7-Psycholo£ical
5- Unknown
9-Other
Total
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Number
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0
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Total
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Evaluation
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3-Ltght Pbcnom.
4-Buds
5-Clouds. Oust, elc.
6-lnsufllc Info.
7-Psychologial
8-Unknown .
9-001^
Total
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0
0
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Total
6
3
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Number
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—&
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2
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Total
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Per Cent r
Ceitam
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5.0
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P.o
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no
Doubtful
/O.O
P.P
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0.0
p.o
PO
p.o
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0.0
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Total
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30,0
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0.0
F.O
9.0
p.o
b'.O
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l/USff 3
/
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Per Cent
Certain
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0-0
1*3
0.0
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p.o
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0.0
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0.0
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0.0
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1*3
A/o T" SrA-7-£~£?
Number
Certain
S-
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p
p
0
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57
Doubtful
a
3
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0
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0
0
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Total
J
24
0
f)
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a-
7o1
Percent
Certain
JJL
12.1
1.0
0.0
LL
211
?/.o
Doubtful
D-D
//?
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P.P
P.0
P.O
p.o
0-0
P,P
10
/f.O
Total
31.1
/7.T
P-0
0P
px
3,2
fS
3.1
162

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.