Railroad Archives Online
- CollectionD0288 - Terence Wahl Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3004 - Railroad Passenger Cars
- ItemTRWahl0028 - Great Northern Passenger Car, Bellingham, Washington, undated
- ItemTRWahl0049 - Great Northern Passenger Car 977, Bellingham, Washington, undated
- ItemTRWahl0065 - Great Northern Observation Car, Bellingham, Washington, undated
- ItemTRWahl0098 - Great Northern Railway Post Office Car 69, Bellingham, Washington, undated
- ItemTRWahl0099 - Great Northern Railway Post Office Car 69, Bellingham, Washington, undated
- 77 more...