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Approximate calculation of multispar cantilever and semicantilever wings with parallel ribs under direct and indirect loading (1932)
NASA Technical Reports Server (NTRS) · leaf 18
N.A.C.A. Technical Memorandum No, 680 Fig, 7 … Pig, 7 Influence lines.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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