Contour interval 20 feet.;"Surveyed in 1919 and 1921.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 map, colored;45 x 36 cm.;1:62,500
Creator:
Geological Survey (U.S.)
Publisher:
Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.)
The University of Illinois Map Library requests the following acknowledgement be included when using this Historical Map: Map provided courtesy of the Map Library at the University of Illinois at Urbana-Champaign.; No Copyright - United States; http://rightsstatements.org/vocab/NoC-US/1.0/