Big Ten Academic Alliance Geospatial Discovery Portal

Big Ten Academic Alliance Geoportal

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Map of the north-western states including Minnesota and the copper region of Lake Superior

Map of the north-western states including Minnesota and the copper region of Lake Superior

1905-01-22. Prime meridians: Washington, D.C. & Greenwich. Below lower left margin: Entered according to Act of Congress in the year 1849 by W. Williams in the...