Advisory Council on Historic Preservation
American Cultural Resources Association
Historical United States Census Data Browser
Midwest Archeological Center
National Historic Preservation Act of 1966 (PDF)
National Park Service
National Register of Historic Places
Society for American Archaeology
Society for Historical Archaeology
Illinois Archaeology Awareness
Illinois Department of Natural Resources
Illinois Historic Preservation Agency
Illinois State Library
Iowa Office of the State Archaeologist
Division of Historic Preservation and Archaeology
Missouri Archaeological Society
Ohio Historic Preservation Office
Wisconsin Historical Society
