Public domain
Production. Copper. Two flotation machines at the Arthur plant of the Utah Copper Company. The bubbles remove the fine particles of copper from the finely ground ore
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Credit lineProduction. Copper. Two flotation machines at the Arthur plant of the Utah Copper Company. The bubbles remove the fine particles of copper from the finely ground ore. 1940-01-01. Feininger, Andreas, United States. Office Of War Information. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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