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Lockheed "Vega" airplane : a commercial cabin monoplane (1927)
NASA Technical Reports Server (NTRS) · leaf 14
N.A.C.A. Aircraft Circular No.61, Fig.l. Fig.l General arrangement drawing of the Lockheed "Vega" commercial airplane.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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