Great Northern Railway Historical Society Blueprint Collection JSBP1290, Duluth, Minnesota, 1923. Great Northern Blueprint Number 235-14, Viaduct at 9th Avenue West. Track Girders Across Ramps. 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 JSBP1289, Duluth, Minnesota, 1923. Great Northern Blueprint Number 235-7, Viaduct at 9th Avenue West. Wind Bracing Details. 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 JSBP1288, Duluth, Minnesota, 1923. Great Northern Blueprint Number 235-6, Viaduct at 9th Avenue West. Detail of Girder Supports and Columns 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 JSBP1287, Duluth, Minnesota, 1923. Great Northern Blueprint Number 235-4, Viaduct at 9th Avenue West. General Arrangement 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 JSBP1286, Duluth, Minnesota, 1923. Great Northern Blueprint Number SKETCH # 235.03, Ninth Avenue Viaduct. Sketch Showing Jct of Timber Ramp and Concrete Roadway. 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 JSBP1285, Duluth, Minnesota, 1923. Northern Pacific Railroad Blueprint Number Sheet 1 AND 2, Np Field Completion Report. Viaduct at 9th Avenue West. Authorization for Expenditure 1664-23. 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 JSBP5461, Saint Paul, Minnesota, 1936. Northern Pacific Railroad Blueprint Number 360803, Ice House. Plan and Elevation. Authorization for Expenditure 760. Interstate Commerce Commission Account Number 16, Station and Office Buildings. Other ICC account descriptions: ICC Account Number 16, Icing Facilities.

Great Northern Railway Historical Society Blueprint Collection JSBP1283, Duluth, Minnesota, 1917. Duluth-Superior Bridge. East End of Draw Rest. Authorization for Expenditure 3086. 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 JSBP1282, Duluth, Minnesota, 1917. Repair to Center Fender. Duluth - Superior Bridge. Authorization for Expenditure 3086. 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 JSBP1281, Duluth, Minnesota, 1915. Great Northern Blueprint Number 110-6-1, Duluth Terminal Trestle. Interlocking and Signaling for Soo Connection With Duluth Terminal Trestle. Authorization for Expenditure 25058. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Interlocking and Signaling.