Great Northern Railway Historical Society Blueprint Collection JSBP1305, Duluth, Minnesota, 1938. Great Northern Blueprint Number 211-1560-318, Duluth-Superior Bridge. Guard Rail for Approaches. Authorization for Expenditure 53331. 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 JSBP1304, Duluth, Minnesota, 1937. Great Northern Blueprint Number 211-1560-313, Duluth-Superior Bridge. Roadway Deck Renewal. Authorization for Expenditure 53331. 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 JSBP1303, Duluth, Minnesota, 1936. Duluth-Superior Bridge. Gasoline Engine Driven Generator. Authorization for Expenditure 50657. 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 JSBP1301, Duluth, Minnesota, 1930. Duluth Superior Bridge. Timber Frame Bent. Authorization for Expenditure 41050. 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 JSBP1299, Duluth, Minnesota, 1923. Dakota Southern Railway Company Blueprint Number H.5405 AND H-5324, Duluth Street Railway Company. Duluth-Superior Bridge Approaches and Street Car Clearance. 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 JSBP1298, Duluth, Minnesota, 1923. Great Northern Blueprint Number 235-9, Viaduct at 9th Avenue West. Details for Drainage and Expansion for Viaduct. 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 JSBP1297, Duluth, Minnesota, 1923. Great Northern Blueprint Number 235-8, Viaduct at 9th Avenue West. Roadway Support at Wharehouse for Viaduct. 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 JSBP1296, Duluth, Minnesota, 1923. Great Northern Blueprint Number 235-5, Viaduct at 9th Avenue West. Typical Cross Section of Viaduct. 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 JSBP1295, Duluth, Minnesota, 1923. Great Northern Blueprint Number 235-10, Viaduct at 9th Avenue West. Foundation Plan Showing Piling and Footings for Viaduct. 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 JSBP1294, Duluth, Minnesota, 1923. Great Northern Blueprint Number 235-2, Viaduct at 9th Avenue West. Detail for Timber Approach to Driveway at 3rd Floor Elevation. Interstate Commerce Commission Account Number 6, Bridges, Trestles, and Culverts. Other ICC account descriptions: ICC Account Number 6, Bridge.