tag:digital.library.illinois.edu,2005:/itemsItems2022-09-15T18:31:21Ztag:digital.library.illinois.edu,2005:Item/668942016-11-15T17:24:43Z2022-09-15T18:31:27ZIllinois, Oregon quadrangleRelief shown by contours and spot heights.University of Illinois at Urbana-Champaign Librarytag:digital.library.illinois.edu,2005:Item/668022016-11-15T17:24:24Z2022-09-15T18:31:21ZIllinois, Taylorville quadrangleContour interval 10 feet.University of Illinois at Urbana-Champaign Library