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Optico-photographic measurements of airplane deformations (1931)
NASA Technical Reports Server (NTRS) · leaf 17
N.A.C.A. Technical Memorandiom No.610 Figs. 1,2,4,6a,6b;8,10,11 j Fig.10 Fig.8NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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