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Torsion and buckling of open sections (1936)
NASA Technical Reports Server (NTRS) · leaf 17
Figs. 1,2,3,4,5,6,7. N . A . C . A Techniecal Memorandum No. 807 rig, 3NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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