Bedrock geologic map of the Port Wing, Solon Springs, and parts of the Duluth and Sandstone 30ʹ X 60ʹ quadrangles, Wisconsin and Minnesota [cartographic material] / by Suzanne W. Nicholson ... [et al.] ; U.S. Department of the Interior, U.S. Geological Survey.
- Relief shown by contours and spot heights. Includes text, location map, Schematic section, Shaded aeromagnetic map.
- U.S. Geological Survey
- Held by
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