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El Paso, Texas. Phelps Dodge refinng company. Working at the electrolytic tanks in which sheets of pure copper are formed
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El Paso, Texas. Phelps Dodge refining company. Interior view of casting house where copper is cast into ingots
El Paso, Texas. Phelps Dodge refining company. Trimming bars of pure copper
El Paso, Texas. Phelps Dodge refining company. Trimming bars of pure copper