Heinkel He 64 C sport airplane (German) : a two-seat low-wing cantilever monoplane (1933)
NASA Technical Reports Server (NTRS) · leaf 6
tfig. 1 N.A.C.A. Aircraft Circular No.175 … from The Argus Die Luftwacht As.8.H and engine. Manufacturers pamphlet. Figure 1.- General arrangement drawings of the He.64c airplane.
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
