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Photographic time studies of airplane paths (1926)
NASA Technical Reports Server (NTRS) · leaf 11
Figs. 1,.2 & 3 N.A.C.A. Technical Memorandum No.345 Direction of wind Fig.l … Fig.2 1 Fig.3NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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