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Drag of Prestone and Oil Radiators on the YO-31A Airplane (1935)
NASA Technical Reports Server (NTRS) · leaf 4
H.A.C.A. Technical Note No. 549 Figs. 1,2 … Figure 1.- Y0-31A airplane with oil and prestone radiators exposed.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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