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Lateral Failure of Spars (1926)
NASA Technical Reports Server (NTRS) · leaf 21
Fig.5 N.A.C.A. Technical Fote "0.232 … Span,inches . 56 in? Average section modulus Fig.5 Span vs.corrected modulus of rupture.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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