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Date: 2014-12-11 20:08:21Economic geology Geology of Minnesota Iron mining Duluth Minnesota Taconite Lake Superior Minnesota Twin Ports Superior Wisconsin Duluth Missabe and Iron Range Railway | Minnesota had Rails, Power, Roads, and PortsAdd to Reading ListSource URL: mcc.mn.govDownload Document from Source WebsiteFile Size: 2,57 MBShare Document on Facebook |