Bier, James AllenBased primarily on U.S.G.S. topographic quadrangles.;Black line drawn map of Illinois;Includes "limit of glaciation" line; Physiographic divisions of Illinois;Landforms, rivers, canals;Relief shown pictoriallyJPEG2000https://digital.library.illinois.edu/items/9dfcd6f0-994e-0134-2096-0050569601ca-dengPublicLandforms of Illinois ; by James A Bier.MapsIllinois1956University of Illinois Urbana-Champaign