Chicago Subway System Built by the Illinois Tunnel Company
This book consists of images and maps detailing the construction of the freight tunnels. A statement on page 5 written by the General Manager and Chief Engineer of the Illinois Tunnel Company, George W. Jackson, refers to "misleading, malicious and vicious reports" about the construction of the tunnels. Jackson states "No deaths have occurred that can be attributed to tunnel construction, and not one employee has been disabled to such an extent as to prevent him from following his usual vocation."