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Optico-photographic measurements of airplane deformations (1931)
NASA Technical Reports Server (NTRS) · leaf 21
Na.C.A. Technical Memorandum No.610 Figs. 21,24,27,29 Fig. 27 Test installation for fatigue tests of a steel spar.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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