Rothrock, A. M. & Biermann, Arnold E. Engine performance and knock rating of fuels for high-output aircraft engines, report, April 1938; (https://digital.library.unt.edu/ark:/67531/metadc54359/m1/1/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .

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