Historic Preservation Agency. Retrieved 16 July 2007. Notes External links Property Information Report, Illinois Historic Preservation Agency, accessed October 23, 2008. Mississippian culture Native American populated places Archaeological sites on the National Register of Historic Places in Illinois Geography of Rockford, Illinois National Register of Historic Places in Winnebago County, Illinois Parks in Illinois Protected areas of Winnebago County, Illinois Tourist attractions in Rockford, Illinois Mounds in Illinois