• Creator
  • Geological Survey (U.S.)
  • Created Date
  • 1911-1911
  • Description
  • Relief indicated by contours and spot heights.; "Surveyed in 1909."; "Contour interval 20 feet."; "Surveyed in cooperation with the State of Illinois. 46 x 34 cm.; 1 map, colored. 1:62,500. Geological Survey (U.S.); Geological Survey Division (Urbana, Ill.).