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Flat sheet metal girders with very thin metal web. Part II : sheet metal girders with spars resistant to bending - oblique uprights - stiffness (1931)
NASA Technical Reports Server (NTRS) · leaf 46
N.A.O.A. Technical lieuorandum Ho.605 Figs . 24, 25,2G Fig.24 … Fi-.25 = dz= cos a Fir:. 25NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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