Image: Calumet and Hecla smelters, Lake Linden, Mich.
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Description: Workers processing copper at the Calumet and Hecla smelter in Lake Linden, Mich between 1900 and 1906.
Title: Calumet and Hecla smelters, Lake Linden, Mich.
Credit: https://www.loc.gov/pictures/item/det1994007117/PP/
Author: Detroit Publishing Co.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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