Public domain
Anaconda smelter, Montana. Anaconda Copper Mining Company. Control panel of the large kiln used in roasting the manganese ore
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineAnaconda smelter, Montana. Anaconda Copper Mining Company. Control panel of the large kiln used in roasting the manganese ore. 1942-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.