tag:digital.library.illinois.edu,2005:/items/a1f1f550-994e-0134-2096-0050569601ca-6Illinois, New Douglas quadrangle : 15-minute series2022-09-15T18:31:51Ztag:digital.library.illinois.edu,2005:Item/700052016-11-30T19:19:49Z2022-09-15T18:31:51ZIllinois, New Douglas quadrangle : 15-minute seriesContour interval 10 feet.University of Illinois at Urbana-Champaign Library