Public domain
El Paso, Texas. Phelps Dodge refining company. Sheets of pure copper are formed by electrolysis in large tanks in later melted and poured into ingots
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineEl Paso, Texas. Phelps Dodge refining company. Sheets of pure copper are formed by electrolysis in large tanks in later melted and poured into ingots. 1942-01-01. Henle, Fritz. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.