prepared from surveys by the Wisconsin Geological and Natural History Survey ; hydrography in charge of L.S. Smith ; field work by L.S. Smith and H.M. Trippe
prepared from surveys by the Wisconsin Geological and Natural History Survey ; hydrography in charge of L.S. Smith ; field work by L.S. Smith and H.M. Trippe
United States Department of Agriculture, Soil Conservation Service ; in cooperation with United States Department of Agriculture, Forest Service and Research Division of the College of Agricultural and Life Science, University of Wisconsin