Public domain
Washington, D.C. Testing substitute gasoline and measuring the degree of wear which it produces on an automobile engine cylinder at the U.S. Bureau of Standards
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineWashington, D.C. Testing substitute gasoline and measuring the degree of wear which it produces on an automobile engine cylinder at the U.S. Bureau of Standards. 1943-01-01. Rosener, Ann. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.