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Coppertown Mining Museum Wikimedia Commons has media associated to Cliffs Shaft Mine.James D. Schuster - Marquette Range Iron Mining Heritage Theme Park Inc. Underground, the Cliffs Shaft Mine was one of many largest iron mines in Michigan, containing sixty five miles (105 km) of tunnels working to depths of http://spencerllhct.blogdigy.com/ergonomics-101-17852675


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