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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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Number Percent Number Per Cent
Evaluation Certain Doubtful Total Certain Doubtful Total ~ertain Doublful Tola! Certain Doubtful Total ,ertlin
0-Ballaon tJ L7 I? atJ /J/J /}t} a 0 tl CM CUI tJ.O /
I-Astronomical rJ (? 17 /}/} /J,/J /J,1 17 /J /} CUJ t),0 ().(!) I?
2-Aircraft 0 {/ 0 tJ,/J /J,t? ,?./J / ~ ? 2d.0 ~.o 60.0 /
3-Light Phenom.. tJ ;J 0 '? ✓J /1/J /').17 /J cJ 0 cu; 0.0 o.o /J
4--Birds ;J /J Cl do /J./J 17tJ 17 ,7 /J t).() 0.0 t!UJ ..?
S-Clouds, Dus~ etc. tl t? 0 /J/J /JtJ Cc? ,7 17 ,:J t?.0 a.o (1.0 0
6-lnsuffic. tnfo. 0 tl /J 17 /J /J,? /JcJ ,? Cl 0 tUJ tJ.tJ tUJ 0
1-PsydlDk>&ic:al 0 t:) 0 t20 tM /7.1'} 0 0 0 t)L} 0.0 ~t:) /J
S.UMM.., I 0 I /PP.l acJ 1,,,,,,, / /J I ZIJ.D 0.0 Zd.t /
!I-Other /J /J 0 /J.O tlr:J 00 I /J I :i!IJ.(J {).tJ 20.0 /J
Total I 0 I IA?.I /J.0 lt?tJ. 5 ?, ~ (.ao ~.o ID(),
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Milt/ /,, £
Number Percent Number Per Cort
Evaluation Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain
0-Balloon tl tJ t) CU) ao ~o tl LJ 0 tfJ.C, o.tJ t!).C} f;'
l·Astrooomical t. /,) 2 3.?.3 o.o 333 /,) 0 0 t},0 ~o Cl.Ci I
2·Airaaft ~ /} z 3.7.3 d. 19 :?.7.3 f ~ .5 ~5 .25'. tl ltf,; H
3-Liat,l1'11010ffl. /J ,? 0 ().0 t:J.& (J,,:J tl tl 0 o.o t:7.0 ao Cl
4-Birds ,? 0 c:> (!).0 (J. 0 (:?,£! 0 0 0 t).O 0.1!/ ao I
S.Clouds. Oust. etc. /J ,J t) ,:,,0 cJ.O ,:1,0 tJ 0 0 cu:: tJ.t) c,tJ LJ
6-lnsuffic.lnfo. 0 0 tJ 0.0 o.o o.o Cl 0 0 ao ao tUJ 1
I-Psychological 0 0 CJ ao &J.0 (7.C 0 tl 0 0.0 o.o 0.0 17
8-Unknown 2.. ,? z 33.'3 o.o ?.?.3 ? tl 2 25:0 eJ.0 25-tJ /0
9-0tller CJ /J 0 Cl.CJ t).(J ~o ,? / I c,.O N.5 11,,; tJ
Total (o CJ a, /()(J_o ?I,() ltJd. s ..3' l? ~2.5 .1'7.5 /iJ(J. 3Z
S°£P-r1:.ua.,,-,- /JA7"~4&,>
Number Per Cent Number PerCmt
Evaluation Certain Doubtful Total Certain Doubtful Total Certain Ooublful Total Certain Doubtful Total ertain
0-Balloon /J / ( C),!J 77 1.1 I t:? I ;ft),() t!).O ZtJ.t CJ
!-Astronomical 11. I 3 1574 17 .ts.I /} /) 0 (J. t) o.O ao .,,
2-Aircraft ? I ¥- 21.I :t.7 Jtl.i I 0 I Zd.tJ d.0 201., /
3-Liehl Pbenom. /J 1J 0 t}.0 o.r:J ,UJ 17 /J 0 ao 0.0 t!),C) CJ
4-Birds ~ / I tJ.t} 17 17 tl 0 0 ao tJ.0 ~t) tJ
S-Clouds, Oust, etc. /J tl tJ t).{? 0.C) o.o 0 0 CJ C),C, ao d.0 t7
6-lnsuffic.lnfo. / tl I 17 t}.0 11 ,? 0 0 tJ.O CJ.(!J ao I
I-Psychological /J ,? 0 t).() t)t) t:?.O /] Cl 0 t:7.t) ,J.O ao 0
&-Unknown ? 0 3 2.1./ d.0 :2.J./ .J' tl 3 ~t!UJ o.o ,,ao tl
9-0ther 0 0 t) tJ.(!} (l.p t7. p CJ cJ 0 t).t) t:J_t} o.cJ /J
Total 7 I/ Jg 1,P.2, .Jp.f /PO, s 0 s /i,Qt) (),0 /00. ·2
184
rH.,--,✓ -A•- ~-
M"'Rt!N
Number Percent
Doubtful Total Certain Doubtful Total
tl I /4.3 ,:;J,0 ';,/..3
I? tJ tJ,() cit? CU)
0 I !ef.l o.o /1/,3
/J t) t;J.0 t).{) tJ.O
6 3 I✓.!.! o.o 9"./.j
17 0 tJ.O cUJ t).o
0 Cl t).t) C).t} O.tJ
0 CJ atJ C/0 CJ.O
/7 I l/✓.J' ao 11¢'.r
/ I 0.0 /Q../ /t/,J
/ 7 ;~5.:1 /;/..f Vt7tJ
f,,,t. v
Nulltler Per Cent
Doubtful Tolal Certain Doubtful Total
2, 7 I/ I 4(¢' 1,c,5
0 I ~.2.. CU) 2.:2,
/,? zz 2t,? -??,:2. iq',O
/ I o.o .2.:Z. ,2,:2,
t!? / .2.2.. 0.0 2.2
,? 0 o.O o.t:> ao
t7 3 L.. 7 t:J.O L..7
/J CJ c>:t d,O o.o
tl /0 221- tl.0 ?2.1.
,,, 0 0.0 ,:,.0 o.o
/.3' 4-S 7/.I 21'> lt)tJ.,
!.Vtl - A-A
Nunt>er Per Cent
Doubtful Total Certain Doubtful Total
c:J CJ ao t:J.O ao
2.. z o,t) 5().1? ,c'/!
LJ I 25.tJ ao 1'25.tJ
t7 CJ tf,0 O.{) o.o
/J 0 t), {} 0.t'.? t).tJ
a 0 {J,0 0.0 t:J.6
0 / ,25:P 0.0 t!i.P
Cl CJ CU) t),{J tic9
/] CJ tUJ ~t) t},0
0 C) tJ.(} o.O ao
z if f,/){) 5"t)t) ;oa
_, ~-,, r- ......At:7.A.;/'J,;"'
A~"IL
Number Per Cent
Certain Doubtful Total Certain Doubtful
tl / I o.o ff.5
17 17 0 o.t! CJ.0
/) / I tJ,0 i'.3
/} 17 t) (J, t:J ,:,.o
t:) /J tJ o.o CU}
/) L7 CJ O,D o.o
!?_ /} z /L..1 C).0
t:? 0 t) C). () CJ,0
9' /7 K' M.. 1 tJ.0
tl 17 0 0.0 17.0
/0 z IZ ?I
/} cJ 0 o.o ().0
/J 0 CJ CJ,0 o.tJ
41' LJ <,l. 12.5 tJ.tl
2.. 0 z L.5 CJ,0
9 t:? Cf .2i.l ().t:J
CJ 0 CJ CJ.CJ 0.tJ
e2 /0 32, d,7 .J'/..3
/JceEM,oc,e
NumbeJ PerCml
Certain Ooubtfu Total Certain Doubtful
/ I z f..3 ~5
I I 2 3..3 f!.g
f V ¥- J!,'.O .i'..1
,,, /J Ci {7.C) (!).CJ
0 /} t7 0,0 C).0
,? 0 CJ 0.0 o.o
/] /J C) o.o o.t:J
t:? Cl CJ rJ.() (J.tJ
2. t) 2 //. 7 CJ,{';,
2.. (? z /1..7 tlCJ
9 3 /Z '/<;,{) 15'.0
Tola!
&'.3
a.o
i'.S
tit'.?
0.0
o.o
IL7
LJ,(}
U.7
t:}.CJ
I~
Total
l/5.L
/1"R
/5.7
.3'.I
0.0
0.0
l:t.5
tf,5
2i. I
acJ
I/ti.a
Total
Jl,.t,
II I
E.3
0,(J
ao
o.o
o. o
o.o
ll..1
l~.'J
100.
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I Case file, from the pursue collection. The PDF is mirrored here; the original link is under it. 312 pages are in the text index: search them above, or from the library's search.