Map PDF PDF of Elevation of the Basal Sand and Gravel of the Middle Illinois River Vall… General Information: Description One 37" x 44" map sheet; includes map, legends, and descriptive text with 4 figures. Publication Details: Publication Date 2012 Authors Richard C. Berg E. Donald McKay III Barbara J. Stiff Map Details: Series ID IMAP 17 Theme Bedrock Scale Category Regional Scale 1:62,500 Ordering Information https://shop.inrs.illinois.edu/map-series.html#3074
