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Worker at zinc smelting plant using protective mask

The operator of a zinc ore leader at a large smelting plant is protected against harmful dust by a mask. From the Eagle-Picher plant near Cardin, Oklahoma. (Source: Photograph by Fritz Henle [1909-1993], January 1943. U.S. Office of War Information. Courtesy of the U.S. Library of Congress, Washington, D.C.)

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