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El Paso, Texas, Phelps Dodge refining company. Interior of a copper refining plant
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Phelps Dodge refining company, El Paso, Texas. Smeltered copper being put on conveyors
Phelps Dodge refining company, El Paso, Texas. Copper anodes on conveyors
Phelps Dodge refining company, El Paso, Texas. Copper anodes on conveyors