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The Cierva "Autogiro" Mark III (British) : Armstrong-Siddeley "Genet Major" Engine (1930)
NASA Technical Reports Server (NTRS) · leaf 7
N.A.C.A. Aircraft Circular No.120 Fig.l L_ Dia.35'0"NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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