Great Northern Railway Historical Society Blueprint Collection JSBP2714, Hobson, Montana, 1917. Bridge # 312. Timber Cribs. Authorization for Expenditure 5762. Interstate Commerce Commission Account Number 6, Bridges, Trestles, and Culverts. Other ICC account descriptions: ICC Account Number 6, Bridge.

Great Northern Railway Historical Society Blueprint Collection JSBP2715, Hobson, Montana, 1918. Great Northern Blueprint Number 173.1937.03, Howe Truss Span. Reinforcement Piers. Authorization for Expenditure 5762. Interstate Commerce Commission Account Number 6, Bridges, Trestles, and Culverts. Other ICC account descriptions: ICC Account Number 6, Bridge.

Great Northern Railway Historical Society Blueprint Collection JSBP2716, Hobson, Montana, 1918. Bridge # 312. Location of Timber Cribs. Authorization for Expenditure 5762. Interstate Commerce Commission Account Number 6, Bridges, Trestles, and Culverts. Other ICC account descriptions: ICC Account Number 6, Bridge.

Great Northern Railway Historical Society Blueprint Collection JSBP2717, Hobson, Montana, 1919. Bridge # 312. Plan. Interstate Commerce Commission Account Number 6, Bridges, Trestles, and Culverts. Other ICC account descriptions: ICC Account Number 6, Bridge.

Great Northern Railway Historical Society Blueprint Collection JSBP2718, Hobson, Montana, 1919. Great Northern Blueprint Number 173.1937.10A, Bridge # 312. Details of Piers. Interstate Commerce Commission Account Number 6, Bridges, Trestles, and Culverts. Other ICC account descriptions: ICC Account Number 6, Bridge.