2004. United States Geological Survey. These line and polygon data layers represent geologic units for Michigan in 2004. They are feature classes within the geodatabase, Michigan_Geologi...
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1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, and 2009. Michigan Center for Geographic Information. This line data layer represents roads for Michigan in 2009. The dataset was originally published by the Michigan Center for Geographic Information ... Michigan Center for Geographic Information.