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2. Re-examining stream sediment geochemical data from the National Uranium Resource Evaluation Program (NURE), Wisconsin and northern Michigan (abs);Barber-Delach;Institute on Lake Superior Geology Proceedings,1999
3. Cannon, W.F., Woodruff, L.G., 2003. The geochemical landscape of northwestern Wisconsin and adjacent parts of northern Michigan and Minnesota (Geochemical Data Files). U.S. Geological Survey Open-File Report 03-259.
4. Cannon, W.F., Woodruff, L.G., Nicholson, S.W., Hedgman, C.A., 1996. Bedrock geologic map of the Ashland and northern part of the Ironwood 30′×60′ quadrangles, Wisconsin and Michigan. U.S. Geological Survey Misc. Inv. Series Map I-2566, scale 1:100,000.
5. Pleistocene geology of the Superior region, Wisconsin;Clayton;Wisconsin Geological and Natural History Survey Information Circular,1985