tag:digital.library.illinois.edu,2005:/itemsItems2022-09-15T18:31:19Ztag:digital.library.illinois.edu,2005:Item/669212016-11-15T17:24:55Z2022-09-15T18:31:28ZIllinois, Barrington quadrangleRelief shown by contours and spot heights.University of Illinois at Urbana-Champaign Librarytag:digital.library.illinois.edu,2005:Item/667432016-11-15T17:23:57Z2022-09-15T18:31:18ZWisconsin-Illinois, Monroe quadrangle : topographyContour interval 20 feet.University of Illinois at Urbana-Champaign Librarytag:digital.library.illinois.edu,2005:Item/667702016-11-15T17:24:12Z2022-09-15T18:31:19ZIllinois-Wisconsin, Grays Lake quadrangle : topographyContour interval 10 feet.University of Illinois at Urbana-Champaign Library