"The index letters and figures on margin of this map correspond with ... Rand McNally & Co.'s Complete City Railway and Street Number Guide to Chicago." Indexed to railroads. Summary: Shows the new street numbering system as of 1909, the "L", railroads, elevated roads, and street car lines. 166 x 67 centimeters Scale [1:158,400]. 2 1/2 inch to 1 mile City Maps