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Vickers "Viastra I" commercial airplane (British) : a high-wing all-metal semicantilever monoplane (1930)
NASA Technical Reports Server (NTRS) · leaf 11
N.A.C.A. Aircraft Circular No* 139 Figs. 3,3,7,8,9,10,11NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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