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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.
“R.G.”2 pages
I I I I I I I I I I I I I I I I I I I I I I i tli&'.LE ALL fEA/i"S Number PerCEflt Evaluation Certain Doubtful Total Certain Doubtful Total certain 0-Balloon 9'i .n /'10 ,7/,4 l,l..4 J.!.1 ti 1-Astionomical 41 .J3 111 9.'1 "1.'I 111 J () 2-Aircraft ,t.'! l'i 10 7,() 4.t, JU 0 3-Light Pha1om. 4 3 7 /LJ IJ.1 l,'1 t) 4-Birds tl 0 (J £1,,1, 0.0 L?,(I I) S-Clouds, Dus~ etc. d (, /() I.P J.(J .2./ 0 6-tnsuffit.lnfo. -2, 0 .2-6 L..; 0.(l ,.~ 0. 7-Psyd1olo1ical II / I :l ,,1.L o., ,U 0 8-Unknown 71/ 0 19 /1?.o /In 'Jt/.o t) !I-Other /J 7 2a 3./ /.1 4.8 b Total .296 /.2-t) 411,, 1'7/.2 ~fl /PP, 0 /9 ro Number Percent Evaluation Certain Doubtful Total Certain Doubtful Total Certain 0-Ballooa ,t' e, j ,i,_4 0.-" t,_4 A I-Astronomical .1- 0 J 11'1 0,/1 :J:1,7 .:l.. 2·Aircraft " 0 Q o.o 0.(} /1,0 I 3-Liiht Phenom. D 0 0 1),0 0,0 ,, 0 "4-Binls 0 0 j t) 0 0 O PO t) 5-Cloud~ Dus~ et~ 0 0 ~ 0,0 "-" O,o ,1 6-lnsuffic.lnfo. ~ 0 ..t. i1.I ,, 0 9/ I 7•Psyctmlo11ical l 0 3 /.3-6, "·" 11.H ,. a.unknown ., 0 2, 9.1 0(1 14.1 .,· 9-0ther ,7 ,..2 :z. 0.0 9./ f/.J 0 Tot~ ;;io .:2 ~~ tf/p_(j '1.I ii()(/, /3 .SPE.-A.5 ALL ~ARS Number Percent Evaluation Certain Doubtful Total Certain Doubtful Total Certain 0.Balloon 4? .J 0 19 19A 1/.i JI, I I-Astronomical _.,.:t ~) liq. 9.1 8.3 11.4 t1 24 Aircraft Jo ~1 If 3 '1.'1 9. I 17.o /) 3-Liaht Phenom. ,!) .3 1 IJ.O /.~ /.2 0 4-Birds I.. I 7 ~4 IJ,4 2A 0 5-Cloud~ Dus~ et~ .r ..2 7 :Z.o o.r :u· 0 6-lnsutfic.lnfo. r 0 a ~-' /)., u (7 7-Psycoolo&ical ,;}.. 0 l 10.I tJ.O /JI 0 8-UnknoMI 49 0 'f9 Jq.3 tl.O J(Ja tJ 9-0ther S' 4 I 1. 3.1 u. 4-, / Total 170 Bil IH'.a ti,.~ 3J./ /PO, .2. /9.ro fmmber Per Cent Evaluation Certain Doubtful Total Certain Doubtful Total ic;ertain 0-Balloon .r I ' 11... 3.d. -1(),/,. ) I-Astronomical I 0 I 3.4 (),tJ J.~ 0 2-Aircraft ( 0 ' .:Jn,1 0.0 :I.IJ.' I :1-Liiht Phenom. p 0 0 t).O 0.0 1),0 C) 4•Birds p 0 0 0.D D.11 "· 0 0 5--Clouds. Oust. etc. 0 0 0 o.o "" 0.0 0 6-lnsuftic. ~lo. I 0 I JJ o.P .3.4. "7-Psyd1olo1ical ,P 0 0 o.o 0,0 o.O b 8-Ullkno• 14 0 I# 4,(_~ 0.0 ,J.f~ .:l.. JOthe, / 0 I .H t1.0 J.t2 0 Total 18 I .29 9t.4' ,M /Pt:7. If Number Doubtful p .2 0 0 0 (II 0 0 0 0 .a Number Doubtful 0 3 I 0 .o 0 0 0 0 0 (f ,.,~ Number Do!Dtful () () 0 0 0 0 e, 0 0 0 0 Number Doubtful ,::, '0 0 0 0 0 0 b 0 I 19 d7 l Jl.o l.hJ.o tl /J..O 0.0 ,o r 1 I l 11.2 , () 0 0 ,,,,., /} (I 0.0 t) tJ.t> 0.0 0.0 / 0 I J.4 I) 0 1d s 0 3 /:J,.O IJ.O ,,~ 0 J S'O.o 0.D ~o.d (7 .3 3 ().() lp.,3 /11,? I 0 I .:Jo 00 ltJo ;t /()/(~ ,!l,() I/....., I I, /3 ,:Z&/ .r.r:2 14.I /1)0 1'f I( .:2.r s(.o 44.o VPP. /9 J7 /9.1-..:? Per Cent Number Percent Number Per Cent Total Certain Doubtful Total ~ertain Doubtful Total Certain Doubtful Total Certain Doubtful Total Certain Doubtful Total I -?M IJ.0 ,,,,,, j',$ ;1.J $'6 2tJ.I /4.11 1~, I 1),0 ~0.IJ 120.0 q I 17 f.J ,t,tl ,,, '1. I i.:/1.0 "·" 1..71.o 1.2. ..20 3 2 7.3 /,2 ..,;i /9.f 0 n.o /J,(J 11'.> c, (J ~ 3 0.0 J.l /,K 0 o.o O.&J 0.IJ t I 7 .! 1 0,1,, 1/,3 () 11,0 "-" fJ. 0 .r ..2. 7 .3.IJ I~ t/. ~ 0 O.o I)_ 0 0.0 .r 0 ! 3.o o.O .J.o 0 O.o n- ,.o ,.l_ 0 l b tl,0 I., :l 4o.o 0.0 ktn.o ol'I 0 l? /'1,1 0.0 17.1 0 IJ.O P.o o.o J- I t .?o 0.1, .?., ~- itJ.o h.O 1/,:v., IO/, f8 I/IA 14,t. J.U //Jt), 201
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.