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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 40
N.A.C.A. Technical Meniorariduin IIo.o05 Figs.14,15 J ; Fi£.14 … Fig.15NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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