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The Airspeed "Courier" commercial airplane (British) : a low-wing cantilever monoplane (1933)
NASA Technical Reports Server (NTRS) · leaf 10
H.A.C.A. Aircraft Circular No.178 Figs. 5,6,7 Figure 7.-Drag bracing.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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