Public domain
Production. Copper. Flotation machines at one of the copper concentrators of the Utah Copper Company. Its plants at Magna and Arthur in Utah are treating vast quantities of the copper so vital for war purposes
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Credit lineProduction. Copper. Flotation machines at one of the copper concentrators of the Utah Copper Company. Its plants at Magna and Arthur in Utah are treating vast quantities of the copper so vital for war. 1940-01-01. United States. Office Of War Information, Feininger, Andreas. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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