tag:digital.library.illinois.edu,2005:/items/9f3bd500-994e-0134-2096-0050569601ca-8
Illinois, Lacon sheet
2022-09-15T18:31:48Z
tag:digital.library.illinois.edu,2005:Item/69942
2016-11-30T19:19:25Z
2022-09-15T18:31:48Z
Illinois, Lacon sheet
Contour interval 20 feet.
University of Illinois at Urbana-Champaign Library