Public domain
Untitled photo, possibly related to: 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
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineUntitled photo, possibly related to: 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. 1942-01-01. Henle, Fritz. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.