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On the knocking of gasoline engines (1926)
NASA Technical Reports Server (NTRS) · leaf 49
N.A.C.A. Technical.Memorandum No.371 Fig.15 o •H … •oos/gOO/S poods uoiq.snquoo ss'Bji 10 H •HNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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