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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.
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EYliuatioo
0-Balloon
l•Astn,nomical
2-Aircrlft
3-Liat,t Phenom.
t.Birds
6-lnsuffic Info.
7-Psycholopcal
!I-Ollienomical
2•Airaaft
3-Liat,tl'llenom.
4-Birds
s-c1..d~ OusL etc
6-!nsuffic.tnfo.
7-Psycholo1ical
&-UnknoMI
9-0ther
Total
Evaluation
0-Balloon
l•Asbtlnomical
2-Aircratt
3-Liat,tPh010m.
4-Birds
!-Clouds, OusL etc
6-lnsuffic.lnfo.
l-Psyci'IJl01ical
&-UnknoMI
9--0ther
Total
Evaluation
0-Balloon
l•Astronomical
2-Ancratt
3-Liat,t Phenom.
4-Birds
5-Clouds, Oust, etc.
6-lnsuffic Info.
l•Psydlolo&ical
&-Unknown
9-0111•
Total
,,,,-,.,
Number Per Cent Number
Certain Oooblful Total ·Certain OOublful Total Certain Ooubtlul
/) /) 17 /J, /) /J, (J tJ. (J 0 .0
✓ I ,:; StUJ d_,;- 1-,,; / /
J7 /) z 1~t? LJ.£} ,?,:-,0 / /}
/J /) (J /}_CJ /JtJ fJ./1 /} 0
0 /J /} tJ./? () /) l'J.n ,? /)
/) /? 0 /J.o CJ.O ao CJ t7
/} 0 /J /l_n /J,/J nn ,? n
0 0 /) 0.0 0. t? l/1,o /) /)
I n I /:/.5 JJ.(J 12.5 / 0
,'.) 0 17 nn /J /) JJ /J tJ 0
7 I I( Ifft,; /?.~ lt!tJ. .? I
7fll{LE A/.1..;- Ev,,u. 149 t:42/1(
.4t.t.. le,tA!.S
Number Pe,C"1I Number
Certain Oooblful Total Certain Ooublful Total Certain Ooublful
.12- d /t 'I!. tl ,,. ., /~1 ,tJ tJ
ZJ /9 ,,,~ Q.S -? 'f 11.CJ I 2,
2i 11 s~ //.j //,). 9 ?2'2. 0 CJ
j z, > I.Z ,H 1..(J t.? 0
?_ ,2, ,/ /J.I tJ.f 1.6 /} /)
I I .z. t ,j tJ.4 tJ.I /) /J
/Q () /9 '1 '7 /),, ?':-:? c) 0
" 0 &, 1 ..t /}/J vi 0 0
5,f /J s// J/9 tJ. () 11.9 2. 0
R /4 /4' rt vi st /} 0
!1L. '7/ £4'1 1/. 3 21.7 /t)tJ _j' ::?.
,,,, ?
fwmber PerC01I Number
Certain Ooublful Total Certain Doubtful Total ertain Ooubttul
/, / 1 ?.0.1 .ff.d #1 ..7 0
J j L. J(l.J ltl..1 IMt I ..7
✓ ? /4 /.['fl /..9 I /J ,!)
... ,.., ,:- 17. 1, ,,_ /> 1111, ,:;- /J
/} 2, ,; /) r, /4 ~ /,. 9 :2 0
.21 f t 9 ?!.I/ .ttt lt:?O. 1'7 ¥
/9, "/
Per Cent
Total Certain Oooblful
t.l /l,/J t,J. tJ
t 2_:; /) :2_,;:p
/ 1!fo /J./J
17 tJ.£) (J. tJ
(J /}, JJ (J. /)
() /}/) tJ,l'J
tJ JJ,/J L).O
tJ /J,LJ JJ.O
I :15.o 0,/J
/.) tU? ,,,_ /)
¢ 1'1'-':L 26.tJ
/~-'1'7
Per Cent
Total Ce!lain Oooblful
tJ ~tJ /,)_ tJ
..1 1/.l,;; ul'J.tJ
CJ 17,/J /J,/J
t? tJ.o /J n
/} ,,.,., JJ /)
JJ t)_/) /J /.)
(J /) /) /JO
CJ 0/J 1.1 rJ
? d/Jn I}()
/) ,, ,, /)/}
s- /4/J/J 'h'J.t)
/y C/
Per Cent
Total Certain Ooublful
J' /1/.1 0. CJ
4" ,/q /¢; .1
5 /()/J ./it
tJ /} /, /J.O
/J /.1,/J ,,, /)
0 d,o '.-:J.O
?. ~5 '7,,
tJ ~tJ /J, 0
., 2!.9 l'J.O
,t, f ,s- 17. /)
2../ lt;.o If.()
199
/ 2/J.i tf).O 1fJ. I
',1 () tJ 1'- :Z, /JO ,tr lf.J / 0 / 4, I 4tJ .(/I
/()(). /() 5" /,:°' II.I.-; H.J VCJti ;t; 5 2c/ '7f 1. f!LJ.i la?,
1,~ 2.
Number Per Cent Number Percent
Total r.;ertain Ooublful Total Certain Ooubtlul Total Certain Oooblful Total Certain Ooublful Tot~
It/.! 20 ,.2,, :tt /./,I ·75 1/),9
19. I // 9 2.0 '1.1. 5.P IU
1?1. ~ //4 ,, /> .U /tJ.5 /.1. I 1ft
1/J,tJ 1 !J_ 5 J?.O I..J' :J!
I/Jo I / 2., ,1. ., ,J.7 ,II'
/). () / I t, ,??' d?' /~
,.5 ~ 0 ., 5:t. ;J /) 5:t.
LJ.O ,I,, 0 ~ 1.9 tJ.O .l.9
2!.S g~ /J .'e:; ??.9 /J. tJ 12.9
9.5 .,,. .:t, '7 CJ /.S ✓,,.
la?. I//J~ ,t/-;, ;r:;-; ltU J't:7.7 vtJa 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.