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 3001 - Steam Locomotives
- 91 more...
- ItemTRWahl1031 - Northern Pacific Steam Locomotive 1612, Bellingham, Washington, undated
- ItemTRWahl0011 - Northern Pacific Steam Locomotive with Train, Larson, Washington, summer, 1951
- ItemTRWahl0396 - Northern Pacific Steam Locomotive 1913, Silver Beach, Washington, undated
- ItemTRWahl0397 - Northern Pacific Steam Locomotive 1913, Silver Beach, Washington, undated
- ItemTRWahl0016 - Northern Pacific Steam Locomotive 1361, Bellingham, Washington, March-May 1951