1986. 2009-08-11T19:28:23Z. 2011-03-28T22:43:58Z. Greenberg, Jeffrey K. Wisconsin Geological and Natural History Survey, University of Wisconsin-Extension. English. Public. Wisconsin and Portage County.
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1986. 2009-09-14T12:50:12Z. 2011-03-29T15:22:54Z. Clayton, Lee, 1938-. Wisconsin Geological and Natural History Survey, University of Wisconsin-Extension. English. Public. Wisconsin and Portage County. Pleistocene.
