• Creator
  • Geological Survey (U.S.)
  • Created Date
  • 1924-1924
  • Description
  • Relief shown by contours.; "Surveyed in 1914."; "Contour interval 20 feet."; "Surveyed in cooperation with the State of Illinois. 45 x 36 cm.; 1 map, colored. 1:62,500. Geological Survey (U.S.); State Geological Survey (Urbana, Ill.).