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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.

Evaiation O-BalloM i-AstMMical 2-AiraaTt 3-LijM Phenoa. 4-Birdj S-Clouds, Dust, etc 6-tarflic M > . 7-Psydioloticii Total f J£ tv/U/) i £>* t£ss NumMr Certain 3 f* t f 0 70 2 7 736 Doubtful 3 77 P _/) - 7 P P 3 ?% ToUl •6 'r? g_ 0 70 '0 5L3fy Per Cent . Certain /3 3S:D 0? AO P.D 4.3 -^1 y.o Si/ Doubtful A3 3A? &W 0& P.O PO /•3 Total £7.9 /J4 P.? P.P 0.1/- 43 P-f 4.3 6>o. Number Certain _ ^ /2- _L P / / / 03 Doubtful J 17 P> O £? P £•? Total 5~ fi-3 *4 1 0 0 6 Q_ l*L ?/ Percent Certain 2-2 13-Z /./ 0.0 Off PO /s~4 2JL Doubtful 3-3 J17 n0.0 t.p 0.0 0.0 0.0 p.o 0.0 30.7' Total ¥73 /./ O.O P.P (M /0O, NUBkbCf ;«1ain 3 2-4 I 0 0 /3 ?4* Doubtful r r 1 P> z.p> / • p if- ^5- Total % 33 //£~ 2- P / ^ 3 t /3? Percent Certain 2-X t*3 P>7 P.6 74 J7.P Zff V7.6 Doubtful /&? P.0 -A2- 0.P JL? 3Z.4 Total rf ~23f 7?i /&4 / & 2J '1-0 £f Number Certain ? IE23 P P P /p 13 %' f Doubtful 9 f /5~ 0 0 0 P 0 P 3 / Total 3$ p p> P 7P X- 33 '2p PerCent Cettain Z5 7i5^ /7.X 0.0 #0 tf-3 HE 23 Doubtful 75 42. /& 0.0 pip 00 '•7 Total •/so P0 00 13 7-7 4.3- 7PO, Evaluation O-Balloon I-Astmoaical 2-Aircntt J-LifhtPrnnoa. 4- Birds 5-Clouds, Dust etc S-lnsuffic fnfo. 7-Psycholoflcal 8-Unknoan Mttier Total Evaluation 0-Balloon 1-Astmomical 2-Airuafl • 3-L.fht Ptumau 4-Birds 5-Clouds, Out, etc 6-lrtsuftic Ufa. 7-Psycaolo(ical 8-Unknow 9-0 th« Total 6/ ?>£s - S Aj/Aiisres Number Certain p 0 t t -A 9 713. Doubtfu '2? f 3/ P J 0 2, / 7S Total 73 63, P 3 'f 7/? Per Cent __j Certain 7J& P.P 3.4 Doubtfu /at 3.0 /'.£ P4 no 77 P.O P.7 04 ZS.0 Total £74 *A /.? PO /,/ 67 Z.2 3.f loo. A-.ft? A Number Certain & _L 0 J M. JL £05 Doubtfu 3/ II 2-3 3 P 0 0 P 3 72- Total u 49 f P 2-P 9 '4~ 7-7? •?iA/vr£S Percent Certain 70.5 M 2.1 1-2 /7.3 4.P MO Doubtful £3 0.0 pif- 0.0 —&P. f.O UP Total 37.1 MS #7 3.3 P.0 P1 %2- 3.2- /7.3 5:/ 100, Nuaber ^ :ertain 21 O P A 4 Jt Doubtfu / / /P 4 2- P? 0 Total 34 33 P £~ 4- 17 43 Percent Certain 2P4 20s Number Certain P P •51 P 0 P 7 £> 4 0 Doubtful 0 / 0 P P £> P 0> P 3 Total 0 // 0 P 0- 2-3 PerCent Certain 43 0.0 0.0 0.0 Z7 Jl 11 43 Doubtful 17.0 0.0 0.0 PP 0,0 00 0.0 P.O 41 39./ Total /fi3 P.0 47? O.c PO 0.C 27 %y n u /oo, S/- 6 0 f£C0A/0S Number Certain p 0 / P $ / 0 JL 0 Doubtfu P 7 7 P P P P 0 p Total 0 / 0 0 / 0 JL _£_ 9 PerCent Certain O.O 0.0 III 0.0 00 0.0 0.0 £Z2 0.0 444 Doubtful 0.6 If. / 33-J O.O 0.0 p.0 00 0.0 o.p 5S-,£ Total 00 77/ I/./ P.0 p.P / / • / P.0 Z2Z P.O 700. Evaluation O-Balloon 1-Astnroaical 2-Aircraft J-Lijtil Prawn. 4-Birds S-Clouds. Oust etc Hrwrlfic pfc. 7-Psycral0|ial t-tMomn Total Nuaber Certain A / /3 P P P 2. 7 3P Doubtful f P f P P 0 p I 0 / • * / • Total " / / fi fi 0 7 1 M4 Percent Certain /?.& 66 7-9.5 00 P.0 P.t 45 '^3 £3 £1.2 Doubtful 0.0 ttx 6.0 00 00 P.O P.0 ao 31. f Total 2S,0 0.0 M7-7 0.0 00 O-o 4.5 46 & 6-JV Af//v//r£s Nuaber Certain 5 2~ S 0 0 1 Q PS Doubtful " 3 3 rp 0- p 0 p 0 0 7/ Total $ sr 7P 3 p P / 0 36 PerCent Certain m sz f3.f 13 0.0 2$ PO 111 %3 694 Doubtful O 13. f P.0 P.P &t P.0 0.P O.0 PO 30.6 Total 73f) P.0 p.c A* P.0 JL UL IT. Doubtful / 0 3 0 0 t//?ti/ A/ar Sr^r/io Number Certain 7 / p 7 U2. 11 JL 37 Doubtful ,2. ,2. 5> O 0 P 0 P A 9 Total S' / 7) p 7 / / PerCent Certain Jf.3 6f /M 2.Z OP P.O 7^2- 0.0 27.9 %7 Z/,4 Doubtful 4.3 AO {>.£> 0.P 0-0 0.0 0.0 43 /f.S Total £ 70.1 U/ O.O O.P I5~2- 0.0 2.3.9 /F.O I0O. 2 3 8

Cases discussed

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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.