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This CIA archives copy, released in 2026, holds Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects). The Air Technical Intelligence Center at Wright-Patterson Air Force Base issued it on 5 May 1955. The study reduced about 4,000 sighting reports from 1947 to 1952 to IBM punched cards, with 3,201 cases charted, and applied chi square tests to compare known and unknown sightings. It concludes that it is highly improbable the reports represent technological developments beyond present-day scientific knowledge.
From the source:Release of 2026-06-12 This is the USAF Project Blue Book with a CIA cover sheet stating the document is "Official Record Copy." With the exception of the handwritten note on the first page, the content of this document has been available on CIA's public website.
“Hill”1 page
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Enlation
IH!11lloao
l•AstKlnl:Nlical
2-Aucnft
Hilllll'llenoa.
4-Bilds
H!Oldl,Dast,etc.
.._....._
:1-l'lydlolo&iCII
.._9-0tllor
Tobi
Enluation
11-Blllloon
1-A-iCllt
l•Aircnlt
Hi&f,tPh-.
4-Birds
~loud~ Dus~ et~
6-lnsuffic. mto.
7-Psydlolopal
8-Unkno•
9-0lller
Totlll
Evaluation
11-Blllloon
l•Astiononlical
2•Aircraft
3-Li&f'lt Phenoa.
4-Birds
~loud~ Dust, etc.
6-lnsuff,c.klfo.
7:Psydlolo~al
11-Unlulo•
9-0lller
Totlll
Enluation
11-Bolloon
1-AslJDnoolic:al
2-Airtrlft
Hilllll'llenoa.
4--Bifds
$-Clouds,Dust,et~
6--ic. llllo.
7-l'lydlolo&iCII.___
-Total
llt.L
s S&CJJNO.'r AHP ,1.flJ'
- Per Cent
Certain Doubtful Tobi Certain Doubtful Tobi
1 7 IP o., /.t. 13
/1/J /fJ 28/, JV 3:l. 7 (f.'I
28 3. fl 5& C't ('I !U
1 ' f- O 5 0 ,; I.O
1 'f fl q5 0 'I /. 'f
I I i "-l 0.2 O.lf
!'I () If 'f.3 0, 0 f. 3
2 0 :l o.5 Oo o. 5
19 (7 Jf 8.' 0.0 gr,
I 0 3 /'3 :n o. 7 3.0
'11( 'J tfH '117 i;i 7.i 'tH I 10.
6'/ S£cp,vos -.S-~NvrF:S
Number Per Cent
Certain Doubtful Total Certain Doubtful Tobi
H 'r-3 108 12. !5 11.J
/I I t, -:l 7 -;;.1 3. I fJ
77 {,/ IJB 1n. 17.f) n2
7 If ti /.If P.O ?1
I 0 I 0. ';/ 0.0 0 '2.
I 7 (J 0 2. l.'t /. I,
i'-1' (J If 't f. 7 0 0 8-7
c; f 9 /. () ().{/ J.e
/ If I 0 in 17 (, 0. 0 27.1,
19 3 :12 3. 7 o., '-f. '3
370 tJB fdP 7U 27.'l /IP.
,S-Jlf'"C,,,YP.5 ~tY,I LESS
Number Per Cent
Certain Doobtful Total Certain Doubtful Tobi
0 0 /} O.P O.D o.u
q I I~ 81.B '1./ 10.'f
0 0 ll u n., O. I
0 0 a o.o o.o o. 0
0 0 0 Q.0 0.0 o. n
{I 0 0 0,0 0.1 o. 0
tJ () () o.o O.P 0 0
0 0 0 0.0 0.0 o.o
() 0 0 o.O 00 o.o
I 0 I 9. I 00 f./
/(} I II 91.1 '-1 Ill,
6/0FCMDS ,S-Af,wtlTFS'
- t"etCenl
Certain 00.btful Tobi Certain Doubtful Tobi
~ /; -< 20.0 0.0 1!1.0
~ t) (;1 OD 0.0 q_o
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I ,:) / /0, 0 /JO /0. 0
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II
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Id tJ /{) JoP. o. 0 /QO,
/,e-#.e~
1.,-/() S£t!t7AIJ15
Number Per Cent
~ertain Ooubllul Tobi Certain Doubtful Total
3 $ 8 /8 3. 0 lf.8
#II 28 7i 1t 3 ,,.a t; J. I
1.., I Jj 38 l'f.'f i.'I 128
I Jf ~ o. t 2.'I 3. 0
I I l o., Q. I, ,.i
0 0 D 0, 0 0.0 0.0
q q
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fl 0 0 0.0 0.0 O.~
11 0 3 / Jf.6 0.0 13-'
'l 0 2. /. 2 O.tJ /. i
/IS f2 I ,7 ,M 3/./ I JO.
t - .i't7 /11/A'VTES
- PerCeot
Certllin Doubtful Total Cerlaill
- Tollll
tr:J -,;o //I) I{. I, II. 0 2t.t
11'1. /'j /.,(J 8.2 3.2 II I/
1,1 ◄ L3 l!Ph f 'J /1, 0 ~0.2
J5 L ::11 1.9 I. I J. p
~ I I u 0. 2 o. 7
.? ~ ( ot O.li /. 0
,:zQ j '31 7.,, o.n 7-lf
JI ~ // 2.1 O.I) -:;. I
IJ9 o !It? nG 0.0 1H
;,;, 9 ~j 3. 0 /. 7 /./-. 7
",71 JO, ,...,,., 7/1.'f 2'!.• /PO.
6-/t? Seco,v175
Number PerC..I
Certain Doubtfu Total Certllin Doubtful Total
/J 0 tJ /)I) tJ) ,11!
6 ,z_ ff ~o $0 /tM./J
£) C) CJ /J.u IJ.tJ t'){J
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0 I) 0 Ol ~o [).{)
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N1111be1 Per Cent
ertain Doubtful Total Certain Doubtful Total
,1 /) ~ 0,(1 o.o o.n
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C) /? {) Q.q 0.1 b.Q
/1 () (J o.o 0./J O.Q
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(i ,., d o.o 0.0 0.0
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153
//-3t? Sb"D.,PS -::I/- 6() S4cowps
Number PerCeot
- Per Cent
~ertain Doubtful Tobi Certain Doubtful Total Certain Doubtful Tobi Certain Doubtful Tota
i 11 I 'I 'U I/.,; 7. I 'f // 20 'I. t S.? /0.2
lit I 7 n 17. '+ (.'f :211 If I (I 25" 7. 7 !. I nil
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/ ;z 3 0.11 0 8 /.'1. 0 1. 2 0. 0 /. 0 I. 0
I I 2 0.'f U,1.f 0-i 6, I 7 1./ o. 5 1.,
(I z 2 0.0 O.i 1).8 0 /) t7 0. 0 (/_0 d.0
/{, t7 It, t.o () p t.O /3 0 13 ,., O.o ,.e,
~ 3 B /.'I I/ 1.0 2 t7 l /. 0 0.1) /. u
n a f~ 21./ O.P no /. I 0 (I 3/./ IJ() 31. (
f 'I /'I l'f H· f 3 1 'J s /. 5 /. 0 ;i.5
183 12 J,5 ,,,_, 30.' /1/0. 11;/i lf6 1f, 7S.5 ']lf.'S IIO.
/?,,,,..,. .?, 7 ,M/~f/T,liS A/,,r <r~y,e-o
- Per Cent llulllber PerC..t
,enain Doubtful Tobi Certain Doubtful Tobi Certain Doubtfu Total Certain DoubtlJI Tota
112. n off· 16. r if-8 21.7 J'f 3 J. 'I/ ,. 'f 1.8 /0. 7
37 17 H /'f.'I 1.8 11.7 /37 '13 130 /t,./ /0, 11 n.o
!'3 IS 2.8 fl t.o /J.1 §It- If f 13 3 9-'I S.B /$. 7
I < ' a I+ O.B 1.1 ~ i 7 Q.' o. 2 0-~
7 (J
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If- II II /.l ().0 /.(, 3 I 'f 0.1/ o.) 0.5
t$' () H t. () n. ~ t.P /1/1 0 /f'J lt.B o. a lt.9
r ( {, VJ 0.11- ✓-'I· B ? ,o 0. 'I o. ~ /. I
(.(. I ((, ,t.', O.P 1t.5 1/7, (/ 177 2H o. I) U.8
13 1 3 n ,.1 t.J; /(II
' so f~ o. 7 f,'I
,,, 50 21/9 79.'! 20./ /OJ. ''5 18 7 8S'2 78.) :ur JDD.
II -.J't? 5~t:CAl£)S 3/-6C J'cCM'LJJ
Nuater Pe,Cent Number PerC..t
Certain Doubtful Total Certain Doubtful Total Certain Doubtfu Total Certain Doubtful Total
I 0 I 0 0./J (.] tJ /) tJ o.n (J_{) aP
If 0 'I- 15.O Q./) ?!.d .2.. I ~ J.5.0 I].~ j?.!
0 I I o,P ,.:i n I!} I I P. O JH IJ.S
(} 0 0 o., ,., o.o 0 l) A u O.I o. 0
Q 0 0 q.o o.o o.o ,, /J I) 0.0 Q.O 0. 0
0 0 0 o.n o.o o.o ,t) ,,; I) p.(J OP ,. p
2 0 °A Jt5 o.o IH t'.. n ,,; o.o 1).0 O.il
p I I 0.0 c.2 ,. z ~ A I) o.O Q.O Q.O
t 0 t n.fi 1.0 315 " /, t/ ,o. 0 o.o so.o
I 0 I C.'2 n.o u ,,, /J b 0.0 o./1 no
I if :2 1{, 87.5 n-s /00. (p ..:, fl 1$'.0 75'.0 /01,
IJUPA '7/1 ,A .~cs I/or <r11re:o
Number Percent Number Percent
ertain Doubtful Total certain Doubllul Total Certain Doubllul Tobi Certain Doubtful Tola
¥' ,1 y U? o.o (,8
I/ \I A< ;B.' t.8 ')f.1/-
,,, " :7 3.f OP 3. If
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, {\ ,1 /: t1 0.0 oo o. 0
' V
'i tJ 7 1/. 'I ()0 II.if
' '3 ,I 9 5.1 /.7 t.8
/_, 17 /.:?. :JQ.1 0 I) ')0.3
/~ /', /~ ,1., 00 13 7
,rs, ,( _,:-,; 5'1.5 !. $ /dp Case file, from the pursue collection. The PDF is mirrored here; the original link is above. 312 pages are in the text index: search them above, or from the library's search.