tag:digital.library.illinois.edu,2005:/itemsItems2022-09-15T18:31:28Ztag:digital.library.illinois.edu,2005:Item/669192016-11-15T17:24:55Z2022-09-15T18:31:28ZIllinois, Herscher quadrangleRelief shown by contours and spot heights.University of Illinois at Urbana-Champaign Library