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Phelps Dodge refining company, El Paso, Texas. Copper is recovered from smoke that pours into these pipes from the furnaces of the refining plant. Sourced from the Library of Congress.

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Phelps Dodge refining company, El Paso, Texas. Copper is recovered from smoke that pours into these pipes from the furnaces of the refining plant. Sourced from the Library of Congress.

More