Paul T. Warner: The Chicago, Milwaukee, St. Paul & Pacific Railroad. A Brief Account of the Development and Operation of the System, with Special Reference to the Motive Power. In: Baldwin Magazine. Oktober 1930 (milwaukeeroadarchives.com [PDF]).
oldmilwaukeeroad.com
Chicago, Milwaukee, St. Paul and Pacific Railroad Company (Hrsg.): Four Generations on the Line: Highlights Along the Milwaukee Road's First Hundred Years. Ringley - O’Brien Press, Chicago 1950 (online).