Great Northern Railway Historical Society Blueprint Collection JSBP1300, Duluth, Minnesota, 1926. Great Northern Blueprint Number 110-601, Duluth Terminal Trestle. Changes In Interlocking and Signaling for Soo With Duluth Terminal Trestle. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Interlocking.

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.

Great Northern Railway Historical Society Blueprint Collection JSBP1293, Duluth, Minnesota, 1923. Great Northern Blueprint Number 235-11, Viaduct at 9th Avenue West. Concrete Bents Fo 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 JSBP1292, Duluth, Minnesota, 1923. Great Northern Blueprint Number 235-1, Viaduct at 9th Avenue West. 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.

Great Northern Railway Historical Society Blueprint Collection JSBP1291, Duluth, Minnesota, 1923. Great Northern Blueprint Number 235-12, Viaduct at 9th Avenue West. Detail of Viaduct at Michigan Street. Interstate Commerce Commission Account Number 6, Bridges, Trestles, and Culverts. Other ICC account descriptions: ICC Account Number 6, Bridge.