tag:digital.library.illinois.edu,2005:/itemsItems2022-09-15T18:31:20Ztag:digital.library.illinois.edu,2005:Item/668032016-11-15T17:24:24Z2022-09-15T18:31:21ZIllinois, Ottawa sheetRelief indicated by contours.University of Illinois at Urbana-Champaign Librarytag:digital.library.illinois.edu,2005:Item/668812016-11-15T17:24:38Z2022-09-15T18:31:26ZIllinois, Wilmington sheetRelief indicated by contours.University of Illinois at Urbana-Champaign Librarytag:digital.library.illinois.edu,2005:Item/667942016-11-15T17:24:21Z2022-09-15T18:31:20ZIllinois, Marseilles sheetRelief indicated by contours.University of Illinois at Urbana-Champaign Library