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Investigation of the variations in the velocity of the air flow about a wing profile (1930)
NASA Technical Reports Server (NTRS) · leaf 19
H.A.C.A. Technical Memorandum No.575 Figs.1.3.3,4,5,6,7. /NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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