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Bending stresses due to torsion in cantilever box beams (1935)
NASA Technical Reports Server (NTRS) · leaf 19
N.A.C.A. Technical Note No. 530 Tig. 4 Root "bulkhead … figure 4.-Test specimens for strain gage tests.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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