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Duluth–Superior / Freighters / Economic geology / Geology of Minnesota / Iron mining / Ore dock / Duluth /  Minnesota / Lake freighter / Duluth /  Missabe and Iron Range Railway / Geography of Minnesota / Minnesota / Geography of the United States


Salt, Sand and Stone Although iron ore, coal and grain get the most attention, they are hardly the only bulk commodities that flow in and out of the Twin Ports. Mountains of minerals move across 13 docks operated by eigh
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Document Date: 2010-09-22 11:09:15


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