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The Parnall "Imp": A New British Light Airplane (1928)
NASA Technical Reports Server (NTRS) · leaf 8
Aircraft Circular No.72 Fig.l A.C.A 21' 3,r~ Armstrong Siddeley "Genet" Engine Fig.l The Parnall"Imp" light airplane.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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