Railroad Archives Online
- FondsD0288 - Terence Wahl Collection
- Série004 - Northern Pacific Railroad Company
- Sous-série014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 005 - Maintenance of Way cars
- PièceTRWahl0411 - Northern Pacific Crane 203397, Bellingham, Washington, undated
- PièceTRWahl0412 - Northern Pacific Crane 21, Bellingham, Washington, undated
- PièceTRWahl0416 - Northern Pacific Crane 336, Bellingham, Washington, undated
- PièceTRWahl0418 - Northern Pacific Bunk Car 203028, Bellingham, Washington, undated
- PièceTRWahl0643 - Northern Pacific Crane 80, Bellingham, Washington, undated