tag:digital.library.illinois.edu,2005:/items/9d2a8720-82d4-0134-1f08-0050569601ca-0
Illinois, Glasford quadrangle
2022-09-15T18:31:29Z
tag:digital.library.illinois.edu,2005:Item/66934
2016-11-15T17:25:01Z
2022-09-15T18:31:29Z
Illinois, Glasford quadrangle
Contour interval 20 feet.
University of Illinois at Urbana-Champaign Library