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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 42
H.A.C.A. Technical Memorandum Ho.604 … Fig.11 "b^t-^sin a- b=t sin cL Fig.l2a Fig.12b P>90° p<90° I/O i EE 4^: o 150° 130°110°900 70° 50° P 4tL Fig.13NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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