• Creator
  • Geological Survey (U.S.)
  • Created Date
  • 1916-1916
  • Description
  • Relief shown by contours and spot heights.; "Surveyed in 1910 and 1914."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet. 45 x 35 cm.; 1 map, colored. 1:62,500. Geological Survey (U.S.); Geological Survey Division (Urbana, Ill.).