Great Northern Railway Historical Society Blueprint Collection JSBP8709, Walton, Montana, 1929. Great Northern Blueprint Number 10.1118, Snowshed # 12. Proposed 3 X 3 Concrete Drain. 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 JSBP8710, Walton, Montana, 1938. Great Northern Blueprint Number 177-76-6, Culvert Number 119. General Plan. Authorization for Expenditure 52525. Interstate Commerce Commission Account Number 6, Bridges, Trestles, and Culverts. Other ICC account descriptions: ICC Account Number 6, Culvert.

Great Northern Railway Historical Society Blueprint Collection JSBP8720, Walton, Montana, undated. Snowshed # 12. Cone Culverts. Authorization for Expenditure 38709. Interstate Commerce Commission Account Number 14, Snow and Sand Fences and Snowsheds. Other ICC account descriptions: ICC Account Number 13, Snow Shed.

Great Northern Blueprint Number 1201-15-1, map of Walton (Essex), 1896. Other subject categories: Right of Way and Track Map