tag:digital.library.illinois.edu,2005:/itemsItems2022-09-15T18:31:29Ztag:digital.library.illinois.edu,2005:Item/669272016-11-15T17:24:58Z2022-09-15T18:31:29ZAssumption quadrangle, Illinois : 15 minute seriesRelief shown by contours and spot heights.University of Illinois at Urbana-Champaign Library