tag:digital.library.illinois.edu,2005:/itemsItems2022-09-15T18:31:29Ztag:digital.library.illinois.edu,2005:Item/667532016-11-15T17:24:04Z2022-09-15T18:31:19ZIllinois, Rushville quadrangleContour interval 20 feet.University of Illinois at Urbana-Champaign Librarytag:digital.library.illinois.edu,2005:Item/667452016-11-15T17:23:58Z2022-09-15T18:31:18ZIllinois, Des Plaines sheetContour interval 10 feet.University of Illinois at Urbana-Champaign Librarytag:digital.library.illinois.edu,2005:Item/699382016-11-30T19:19:24Z2022-09-15T18:31:48ZIllinois-Indiana, Mount Carmel quadrangle : topographyContour interval 20 feet.University of Illinois at Urbana-Champaign Librarytag:digital.library.illinois.edu,2005:Item/669312016-11-15T17:24:59Z2022-09-15T18:31:29ZIllinois, LaSalle sheet : reconnaissance mapContour interval 10 feet.University of Illinois at Urbana-Champaign Library