The engineers describe many cases of settlement. At the Marshall Field wholesale store, for example, they discovered that "the sinking at the intersection of State street and Jackson boulevard was caused when the turnout curves at the intersection of the tunnels were constructed."
Chicago (Ill.). Dept. of Public Works. Engineering Commission, Report to the Commissioner of Public Works, Chicago, on the Tunnels of the Illinois Tunnel Company by the Engineering Commission, Appointed July 6, 1905. Chicago: Press of Stevens, Maloney & Co., 1905. Crerar microfm TF850.C4 1905