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11. Geological highway map of the northern Great Plains region North Dakota, Nebraska, South Dakota, Iowa, Minnesota /
Bennison, A. P. American Association of Petroleum Geologists,.
12. Outcrop map of southern part of Duluth Complex and associated Keeweenawan rocks, St. Louis and Lake Counties, Minnesota
Bonnichsen, Bill. Minnesota Geological Survey, University of Minnesota,.
13. Preliminary geologic map of the Vermilion district and adjacent areas, northern Minnesota
Minnesota Geological Survey, University of Minnesota :.