Copper mining in Michigan
http://dbpedia.org/resource/Copper_mining_in_Michigan an entity of type: Thing
Copper mining in Michigan became an important industry in the 19th and early 20th centuries. Its rise marked the start of copper mining as a major industry in the United States.
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Copper mining in Michigan
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Copper mining in Michigan
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Copper mining in Michigan became an important industry in the 19th and early 20th centuries. Its rise marked the start of copper mining as a major industry in the United States.
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