Sectional Map of Illinois Showing the Botany, Topography & Geology of the State. Drawn by Prof. Walling. Compiled And Published By Rufus Blanchard. Chicago, 146 Lake St. Illinois. 1869. Entered ... 1869, by R. Blanchard ... Illinois. (inset) Geological Map Of Illinois. (inset) Illinois Geological Survey Longitudinal Section of the Mississippi River Bluffs, from Dunleith to Cairo.