• Creator
  • Geological Survey (U.S.)
  • Created Date
  • 1918-1918
  • Description
  • Relief shown by contours and spot heights.; "Surveyed in 1917."; "Surveyed in cooperation with the War Department and the State of Illinois."; "Contour interval 20 feet. 45 x 33 cm.; 1 map, colored. 1:62,500. Geological Survey (U.S.); War Dept., Corps of Engineers, U.S. Army (U.S.); Geological Survey Division (Urbana, Ill.).