Great Northern Railway Historical Society Blueprint Collection JSBP4132, Paola, Montana, 1904. Great Northern Blueprint Number E.406.01, Snowshed. Proposed Protection Shed at Tunnel # 2. Interstate Commerce Commission Account Number 14, Snow and Sand Fences and Snowsheds. Other ICC account descriptions: ICC Account Number 13, Snow Shed.

Great Northern Railway Historical Society Blueprint Collection JSBP4133, Paola, Montana, 1904. Great Northern Blueprint Number Sheet #2, Proposed Protection Shed. Sections. Interstate Commerce Commission Account Number 14, Snow and Sand Fences and Snowsheds. Other ICC account descriptions: ICC Account Number 13, Snow Shed.

Great Northern Railway Historical Society Blueprint Collection JSBP4134, Paola, Montana, 1904. Great Northern Blueprint Number Sheet #1, Proposed Protection Shed. Section. Interstate Commerce Commission Account Number 14, Snow and Sand Fences and Snowsheds. Other ICC account descriptions: ICC Account Number 13, Snow Shed.