Browse Illinois State Geological Survey (ISGS) by Contributor "Midwest Friends of the Pleistocene. Field Conference (32nd : 1985 : Rockford, Ill., etc.)"
Now showing items 1-1 of 1
Illinoian and Wisconsinan stratigraphy and environments in northern Illinois : the Altonian revised (Champaign Ill. : Illinois Dept. of Energy and Natural Resources, State Geological Survey Division,, 1985)