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Physiographic Divisions of Illinois.
Leighton, M. M., G. E. Ekblaw, and L. Horberg 1948. Physiographic Divisions of Illinois. ISGS Report of Investigations, No. 129. Illinois State Geological Survey, Champaign, Illinois. SEE ALSO http://www.isgs.uiuc.edu/isgsroot/isgshome/fra3.htm
Image courtesy of Illinois Department of Natural Resources & the Illinois State Geological Survey.