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Method of curved models and its application to the study of curvilinear flight of airships. Part I (1937)
NASA Technical Reports Server (NTRS) · leaf 45
.A.C.A. Technical Memorandum No. 829 Figs. 9,10NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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