Geologic map of Precambrian rocks, southern Lake Superior region, Wisconsin and northern Michigan / U.S. Department of the Interior, U.S. Geological Survey ; compiled by P.K. Sims ; prepared in cooperation with the Wisconsin Geological and Natural History Survey
Series Titles:
Miscellaneous investigations series ; map I-2185 Miscellaneous investigations series (Geological Survey (U.S.)) ; map I-2185.
Variant Titles:
Lake Superior region, Wisconsin and northern Michigan