Railroad Archives Online
- CollectionD0288 - Terence Wahl Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3005 - Maintenance of Way cars
- ItemTRWahl0411 - Northern Pacific Crane 203397, Bellingham, Washington, undated
- ItemTRWahl0412 - Northern Pacific Crane 21, Bellingham, Washington, undated
- ItemTRWahl0416 - Northern Pacific Crane 336, Bellingham, Washington, undated
- ItemTRWahl0418 - Northern Pacific Bunk Car 203028, Bellingham, Washington, undated
- ItemTRWahl0643 - Northern Pacific Crane 80, Bellingham, Washington, undated