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Performance of a Liberty 12 airplane engine (1921)
NASA Technical Reports Server (NTRS) · leaf 19
REPORT NATIONAL ADVISORY COMMITTEE TOR AERONAUTICS. 20 … Percent O/sfilled. Fig. IS. 'Pressure in cm. oiKg. ONASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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