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Keywords: Geologic Map Lake Superior MN WI MI.jpg LargeImage en Bedrock geologic map of the US area bordering Lake Superior in Minnesota Wisconsin and Michigan Minnesota Geological Survey University of Minnesota ftp //mgssun6 mngs umn edu/map_catalog/jp2k/umn22628 jp2 Morey G B Sims P K Cannon W F Mudrey M G Jr D L Southwick 1982 PD-MGS Geological maps of Wisconsin Geological maps of Minnesota Geological maps of Michigan Maps of Lake Superior |