Public domain
William Shold and Fred Wentworth checking gas consumption of a tractor during a brake test experiment. Iowa State College. Ames, Iowa
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineWilliam Shold and Fred Wentworth checking gas consumption of a tractor during a brake test experiment. Iowa State College. Ames, Iowa. 1942-01-01. Delano, Jack. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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