1. State of Illinois : compiled from the official records of the General Land Office and other sources under the supervision of G.P. Strum. Maps University Of Minnesota Public content 1885. Strum, G. P. (Gustave P.). Relief shown by hachures. 75 x 46.5 centimeters Scale 1:887,040. 14 miles to 1 inch General Map Collection. United States General Land Office.