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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Date: 2010-09-22 11:09:15 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 Add to Reading List Source URL: www.duluthport.com Download Document from Source Website File Size: 299,95 KB Share Document on Facebook

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