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Comparative Performance Obtained with XF7C-1 Airplane Using Several Different Engine Cowlings (1930)
NASA Technical Reports Server (NTRS) · leaf 21
N.A.C.A. Technloal Note No.334 Figs.4,5,6NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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