Public domain
Anaconda smelter, Montana. Anaconda Copper Mining Company. Workman inspecting the roasting process of manganese ore, which is a carbonate of manganese called pink rhodochrosite
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineAnaconda smelter, Montana. Anaconda Copper Mining Company. Workman inspecting the roasting process of manganese ore, which is a carbonate of manganese called pink rhodochrosite. 1942-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.