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Measurement of Profile Drag on an Airplane in Flight by the Momentum Method. Part I (1930)
NASA Technical Reports Server (NTRS) · leaf 52
Figs.12,13,14, N.A.C.A, Technical Memorandum No.55? 4 Jiff 1,8 1O0/CNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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