Railroad Archives Online
- CollectionE0357 - Wade J Stevenson Collection
- Series002 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3004 - Railroad Passenger Cars
- ItemGNRHS.55.02.02 - Great Northern Observation Car 1192, "Flathead River", undated
- ItemGNRHS.55.02.03 - Great Northern Observation Car 1192, "Flathead River", undated
- ItemGNRHS.55.02.04 - Great Northern Observation Car 1192, "Flathead River", undated
- ItemGNRHS.55.02.31 - Great Northern Pullman Coach in Great Northern Livery in Washington State, undated
- ItemGNRHS.55.06.21 - Great Northern Great Dome 1392, "Mountain View" in Washington State, undated
- 20 more...