Public domain
Electric phosphate smelting furnace used in the making of elemental phosphorus in a TVA chemical plant in the Muscle Shoals area, Alabama
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineElectric phosphate smelting furnace used in the making of elemental phosphorus in a TVA chemical plant in the Muscle Shoals area, Alabama. 1939. Palmer, Alfred T.. FSA/OWI Color Photographs, Library of Congress. Public domain.