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Substitute fuels tested. Emmet L. Reed, laboratory assistant at the U.S. Bureau of Standards, uses a special microscope to measure the degree of wear which substitute gasoline has produced on an automobile engine cylinder
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Credit lineSubstitute fuels tested. Emmet L. Reed, laboratory assistant at the U.S. Bureau of Standards, uses a special microscope to measure the degree of wear which substitute gasoline has produced on an autom. 1935-01-01. Rosener, Ann. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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