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Comparative Performance Obtained with XF7C-1 Airplane Using Several Different Engine Cowlings (1930)
NASA Technical Reports Server (NTRS) · leaf 22
"~ Figs.7,8,9 N.A.C.A. T«ohnlcal Not« No.334NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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