• Creator
  • Geological Survey (U.S.)
  • Created Date
  • 1910-1910
  • Description
  • Relief indicated by contours and spot heights.; Surveyed in 1908.; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet. 36 x 45 cm.; 1 map, colored. 1:62,500. Geological Survey (U.S.).