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Flight Tests of N.A.C.A. Nose-slot Cowlings on the BFC-1 Airplane (1939)
NASA Technical Reports Server (NTRS) · leaf 22
Figs. 1,3 N.A.C.A. Teohnioal Note No. 730 Figure 3.- The BFC-1 airplane equipped with noee-elot cowling 1.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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