Railroad Archives Online
- CollectionD0288 - Terence Wahl Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3001 - Bridges
- 4 more...
- ItemTRWahl0249 - Northern Pacific Bridge 61.1, Arlington, Washington, undated
- ItemTRWahl0374 - Northern Pacific Bridge 104, Acme, Washington, undated
- ItemTRWahl0375 - Northern Pacific Bridge 104, Acme, Washington, undated
- ItemTRWahl0390 - Northern Pacific Bridge 110, Deming, Washington, undated
- ItemTRWahl0391 - Northern Pacific Bridge, Deming, Washington, undated
- ItemTRWahl0392 - Northern Pacific Bridge 110, Deming, Washington, undated
- ItemTRWahl0393 - Northern Pacific Bridge 01609, Bellingham, Washington, undated
- ItemTRWahl0649 - Northern Pacific Bridge, Bellingham, Washington, undated
- ItemTRWahl1075 - Northern Pacific Bridge, Bellingham, Washington, undated