Geological Survey (U.S.)Contour interval 20 feet.;"Illinos culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army";"Surveyed in 1926";Relief shown by contours and spot heights.;1 map, colored;45 x 36 cm.;1:62,500JPEG2000https://digital.library.illinois.edu/items/9def1630-82d4-0134-1f08-0050569601ca-2engGeological Survey (U.S.)Geological Survey Division (Urbana, Ill.)Kentucky Geological Survey (Lexington, Ky.)PublicKentucky-Illinois Smithland quadrangleMapsIllinoisKentucky1929University of Illinois Urbana-Champaign