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[Untitled photo, possibly related to: El Paso, Texas, Phelps Dodge refining company. Electrolytic tanks in which sheets of pure copper are formed. The sheets are later melted and cast into ingots]. Sourced from the Library of Congress.

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[Untitled photo, possibly related to: El Paso, Texas, Phelps Dodge refining company. Electrolytic tanks in which sheets of pure copper are formed. The sheets are later melted and cast into ingots]. Sourced from the Library of Congress.

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