Railroad Archives Online
- CollectionD0288 - Terence Wahl Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2004 - Railroad tracks
- Subseries Level 3001 - Railroad mainline
- ItemTRWahl0132 - Great Northern Track, Scenic, Washington, undated
- ItemTRWahl0237 - Great Northern Track, Bellingham, Washington, undated
- ItemTRWahl0278 - Great Northern Track, Bellingham, Washington, undated
- ItemTRWahl0304 - Great Northern Track, Bellingham, Washington, undated
- ItemTRWahl0359 - Great Northern Track, South Bellingham, Washington, undated
- ItemTRWahl0360 - Great Northern Track, South Bellingham, Washington, undated
- ItemTRWahl0376 - Great Northern Track, Bellingham, Washington, undated
- ItemTRWahl0377 - Great Northern Track, Bellingham, Washington, undated
- ItemTRWahl0431 - Great Northern Track, Bellingham, Washington, undated
- 21 more...