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Calumet and Hecla Safety Sign |
Natural Resources, Mines and Mineral Resources, Copper Mines and Mining, Manners and Customs, Miners, Copper Miners |
Calumet & Hecla and Subsidiaries Safety Firse information board. [Image shows a sign that provides information on Calumet and Hecla's safety regulations.] Scanned: June 13, 2013 |