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Phelps Dodge refining company, El Paso, Texas. Sheets of pure copper, which had been formed by electrolysis in huge tanks…
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Phelps Dodge refining company, El Paso, Texas. Sheets of pure copper, which had been formed by electrolysis in huge tanks, being melted now and cast into ingots. Sourced from the Library of Congress.

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Phelps Dodge refining company, El Paso, Texas. Sheets of pure copper, which had been formed by electrolysis in huge tanks, being melted now and cast into ingots. Sourced from the Library of Congress.

More