[Reston, Va.] : U.S. Department of the Interior, U.S. Geological Survey, 2006
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Map
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Bedrock geologic map of the Port Wing, Solon Springs, and parts of the Duluth and Sandstone 30ʹ X 60ʹ quadrangles, Wisconsin and Minnesota / by Suzanne W. Nicholson [and others].
Relief shown by contours and spot heights. Title from title screen (viewed on Dec. 9, 2015). All of the area covered is in Wisconsin, chiefly in Douglas and Bayfield Counties.