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census.gov
U.S. Census Bureau (2002). "Government Organization"(PDF). 2002 Census of Governments. 1 (1). Washington, DC: U.S. Government Printing Office: 8. GC02(1)-1.
Long, David (2001). "Townships"(PDF). StoryLines Midwest. American Library Association. Discussion Guide No. 1. Archived from the original(PDF) on November 20, 2012.