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Project Blue Book Special Report No. 14: Analysis of Reports of Unidentified Aerial Objects

United States Air Force, Air Technical Intelligence Center · 1955-05-05 · 309 pages · text from the file's own layer

Special Report No. 14 was issued by the U.S. Air Force's Air Technical Intelligence Center on 5 May 1955. It is a statistical study of about 4,000 reports of unidentified aerial objects from June 1947 to December 1952. The reports were reduced to IBM punched cards and analyzed with methods including chi square tests. The report concludes that the reports it examined are very unlikely to represent technology beyond present scientific knowledge, and it notes that no case produced valid physical evidence.

m
Evaluation
O-Balloon
1-Astmroaical
2-Airaaft
3-Lijht Pnenon.
4-Birds
5-Clouds, Dust, etc
6-lrmiflit h b .
7-PjrrtokJiical
t - U n k n n
Total
Evaluation
O-Balloon
1-Astnnoaical
2-Airaaft
3-Lijtit Ptiaxw.
4-Birds
5-Clouds, Dust, etc
6-lnsuflic Info.
7-Psydnki(ical
8-Unkmm
Miner
Total
Evaluation
O-Balloon
1-Astranomical
2-Airaaft
3-Lijbt Phooo.
4-Birds
5-Clouds, Oust, e t c
S-lnsuffic Into.
7-Psyanlojical
D-Unknomn
Wither
Total
J* A/ !//>£
0
$
?
0
3
0
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0.0
6.0
5.3.
lo.6
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Doubtful
o.d
0.0
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6.0
0.6
0.6
00
O.o
Ji-3
Total
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0.0
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0.0
5-3
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513
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63
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Total
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6
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Total
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3
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3?3
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Tot *
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y].i>
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PerCent
Certain
yd
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dd
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SJ
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Doubtful
ad
31/. d
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06
od-
d.d
44
d.6
d.d
3-1.6
Number
Certain
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d
d
/
3
2
1
•2-0
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4
7
d
d
d_
0
0
d
d
0
1 /
Total
0
0
0
i
3
a.
j
3J
Certain
3.X
0 6
0,6
6.6
3.2
9.7
£>.5
3.1
PerCent
Doubtful
JiL3
Total
£.4
36. d
e.d
6&
d-d
2.0
fl.O
V*
/to.
Total
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0 0
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3.1
o.o
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3-A
1.1
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3.2
HO.
i
113

Cases discussed

About this file

Analysis, from the classic collection. 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.