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