Webum > Regional > North America > United States > Regions > Midwest > Maps and Views Illinois@ Indiana@ Iowa@ Michigan@ Minnesota@ Missouri@ Ohio@ Wisconsin@ Roads and Highways@ See also Regional > North America > Regions > Great Lakes > Maps and Views Regional > North America > United States > Maps and Views Central Great Lakes Geologic Mapping Coalition Partnership for the purposes of producing detailed, three dimensional surficial materials maps of the central Great Lakes States. Includes downloadable fact sheet and background of this partnership with Geological Surveys of Illinois, Indiana, Michigan, and Ohio, and USGS. Help build the biggest human edited directory on the internet Add your website - Open Directory Project - Become an editor