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The Bernard 80 G.R. long-distance airplane (French) : a two-place cantilever monoplane (1931)
NASA Technical Reports Server (NTRS) · leaf 9
N.A.C.A. Aircraft Circular No.147 Figs. 9,10,11,12NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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