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The Avia 51 commercial airplane (Czechoslovakian) : a cantilever high-wing monoplane (1934)
NASA Technical Reports Server (NTRS) · leaf 7
Figs- 4,5,6 N.A.C.A. Aircraft Circular No. 188NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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