Railroad Archives Online
- CollectionE0045A - Great Northern Railway- Blueprint-Authorization for Expenditure Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3008 - Tunnels
- ItemJSBP0447 - Great Northern Railway Historical Society Blueprint Collection JSBP0447, Belton, Montana, 1943.
- ItemJSBP0448 - Great Northern Railway Historical Society Blueprint Collection JSBP0448, Belton, Montana, 1957.
- ItemJSBP0449 - Great Northern Railway Historical Society Blueprint Collection JSBP0449, Belton, Montana, 1958.
- ItemJSBP0494 - Great Northern Railway Historical Society Blueprint Collection JSBP0494, Berne, Washington, 1948.
- ItemJSBP0495 - Great Northern Railway Historical Society Blueprint Collection JSBP0495, Berne, Washington, 1948.
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