• Creator
  • Geological Survey (U.S.)
  • Created Date
  • 1915-1915
  • Description
  • Relief shown by contours and spot heights.; "Surveyed in 1912."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet. 45 x 36 cm.; 1 map, colored. 1:62,500. U.S. Geological Survey (Washington, D.C.); Geological Survey Division (Urbana, Ill.), 1915.