| http://www.w3.org/ns/prov#value | - Chapter 2Book2818Golden West Books, San Marino, CAChuck SouleNorthern Pacific Railway History: 1925-1945 Frey, Robert L., Schrenk, Lorenz P. Northern Pacific Supersteam Era, 1945-19701985Political, economic, operational history of the Northern Pacific Railway from 1925 to 1945, including the controlling factors to promote the construction of large, modern steam locomotives that would not need help
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