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English airplane construction (1930)
NASA Technical Reports Server (NTRS) · leaf 12
K.4..C.A. Technical Meuorand-at Bo.595 Figi. 1,3,4,5,6,7,8,9,11 Tig*.6,7 Boulton and Paul spar and Hawker tubular Junction point. «parNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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