• Creator
  • Geological Survey (U.S.)
  • Created Date
  • 1916-1916
  • Description
  • Relief shown by contours and spot heights.; "Surveyed in 1913-1914."; "Contour interval 20 feet."; "Surveyed in cooperation with the State of Illinois."; Coordinates (W 88⁰30’00"--W 88⁰15’00"/N 37⁰45’00"--N 37⁰30’00"). 45 x 36 cm.; 1 map, colored. 1:62,500. Geological Survey (U.S.); State of Illinois State Geological Survey (Urbana, Ill.).