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
- 20 more...
- ItemGNRHS.55.21.01 - Great Northern Heater Car 11, undated
- ItemGNRHS.55.21.03 - Great Northern Heater Car 11, undated
- ItemGNRHS.55.21.09 - Great Northern Railway Post Office (RPO) Car 1108, undated
- ItemGNRHS.55.21.10 - Great Northern Railway Post Office (RPO) Car 1108, undated
- ItemGNRHS.55.21.31 - Great Northern Dome Car 1323, undated