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This is Project Blue Book Special Report No. 14, "Analysis of Reports of Unidentified Aerial Objects," Project No. 10073, dated 5 May 1955. The study reduced about 4,000 sighting reports received by the U.S. Air Force between June 1947 and December 1952 to IBM punched cards and analyzed them statistically, including chi square tests comparing knowns with unknowns. It concludes that the reports very probably do not represent technological developments beyond present scientific knowledge, and it notes that no case produced physical evidence.
“Midwest”5 pages
Era-mboo 0-Balloon l-Zutmrnieal Mirenfl 3-UeMPtnnon. 4-Birds S-Clouds, Dust, etc 6-lnMflic toh. 7-PjydBkiFcal t-IMomar MKwr Total Nucaber Certan 2? 6 0 2 ? 21 7b 0 •S 0 72 o01 1 m Doubtful 9 2 0 7 0 0 I 0 0 0 '7 V9 ToUl 20 11 3 6 0 S j •22 0 if iB Hi, PerCent Certain f.C 17.7 i3.f o.O 3. 0 0.0 0.0 n.5 O.C 10.5 Doubtful 7J '2.0, 1.2 Q.O 0 0 O.C 00 0.0 0.0 JO.7 ?? S ToUl 12.1 11.1 it.) 0.0 3.0 6.C /I.i 0.0 '7-5 JD.& 100- Certain 7 S2 73 i 0 7( 2 £•) 2 nf A'fi Nvinber Ooubttul 3 9 8 0 1 0 0 0 0 o i i ToUl 10 CJ 3C i S 0 7i 2 S7 7 2 00 f CsUin J 5- •2C9 it I 0i l 9 0 1 130 1 0 Iff erCent Doubtful '•y H.S *.O o.O O.S 0.0 Q.Q 0.0 O.Q 0.0 iff-5 Total s-o 3QJ o.S 7.$ 0.0 /3.0 1.0 2g.S \~T.o J0S. Enluatkxi O-Bailooa tAstnnical 2-Aircnft 3-Li|ht Pbenoa 4-Birds Klouds, Oust, etc S-lnsuffic kilo. 7-Psyd»l0|ical S-lMnom Mthcr Total Nttabet Certan QH 05 3 0 8 72 0 36 9 US Doubtfu 5 JO IS 3 2 0 0 0 0 f- 3? Total 2? 38 ¥0 C Z 8 Ql 0 36 13 nv Percent Certain J2'f IM '2.9 J.5 o.t JLL\ it.3 o.o ig.C t.L 7t.f Doubtfu 2-t S-2 7 7 1. 0 0.0 0.1 0.* QO 3.-I 2D.I Total /r.o 116 10-( 3.4 1.0 H-f //.3 Q.0 184 -hi 100. Certain liC 2f 3o 1 0 0 ?7 Total 37 s 7 I 12 1 It 9- m PefCent Certan 81 21.9 5.7 OS 2b AJ. (-1 OS 1*7 / C C-S.l Doubtful JQ.j /Of f.f ? 1 1-0 O.S Q.O 0.0 Q.O o-s .3t 0 0 0 0 Q 0 0 sz Total Ji Cl 76 / 0 0 7 90 ? Ji& Percent Certan *H 'ft 7.1 U 0.1 0.0 S.9 S-f 2U S-9 cio DaiHIul H-2 'SS 8 3 9.1 0.0 0.0 0.0 Q.Q 0.0 00 Total IS.? o.c 0.0 SLO ry 2.H US 109
Report, cited by the archive. 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.