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Spartan "Cruiser" commercial airplane (British) : a six-seat low-wing cantilever monoplane (1932)
NASA Technical Reports Server (NTRS) · leaf 7
N.A.C.A. Aircraft Circular No. 168. Pigs. 2,3NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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