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Flat sheet metal girders with very thin metal web. Part I : general theories and assumptions (1931)
NASA Technical Reports Server (NTRS) · leaf 40
U.A.C.A. Technic&l Memorandum No.604 Figs.4,5,6,7,8NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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