Map PDF PDF of Bedrock Topography of the Middle Illinois River Valley General Information: Description One 38" x 44" map sheet; includes map, legends, and descriptive text with 2 figures. Publication Details: Publication Date 2009 Authors Richard C. Berg C. Pius Wiebel Andrew J. Stumpf E. Donald McKay III Map Details: Series ID IMAP 15 Theme Bedrock Topography Scale Category Regional Scale 1:62,500 Ordering Information https://shop.inrs.illinois.edu/map-series.html#3072
