Public domain
Butte, Montana. Anaconda Copper Mining Company. Cars dump copper ore automatically into hoppers from which it is lifted to surface
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineButte, Montana. Anaconda Copper Mining Company. Cars dump copper ore automatically into hoppers from which it is lifted to surface. 1942-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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