Public domain
War work in the groove. A modern rifling machine cutting the grooves in a gun barrel
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineWar work in the groove. A modern rifling machine cutting the grooves in a gun barrel. 1940-01-01. United States. Office For Emergency Management, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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