Railroad Archives Online
- CollectionD0027 - Timothy Miller Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3001 - Bridges
- 2582 more...
- ItemBB025931 - Great Northern Engineering Drawing: Design Telegraph Wire Towers, Bridge 4 - Salmon Bay, Ballard, Washington, undated
- ItemBB025932 - Great Northern Engineering Drawing: Design Telegraph Wire Towers, Bridge 4 - Salmon Bay, Ballard, Washington, undated
- ItemBB025933 - Great Northern Engineering Drawing: Telegraph Wire Tower, Bridge 4 - Salmon Bay, Ballard, Washington, undated
- ItemBB025934 - Great Northern Engineering Drawing: Shop Plan - Telegraph West Tower, Bridge 4 - Salmon Bay, Ballard, Washington, undated
- ItemBB025935 - Great Northern Engineering Drawing: Shop Plan - Telegraph West Tower, Bridge 4 - Salmon Bay, Ballard, Washington, undated
- ItemBB025936 - Great Northern Engineering Drawing: Shop Plan - Telegraph West Tower, Bridge 4 - Salmon Bay, Ballard, Washington, undated
- ItemBB025937 - Great Northern Engineering Drawing: Shop Plan - Telegraph West Tower, Bridge 4 - Salmon Bay, Ballard, Washington, undated
- ItemBB025938 - Great Northern Engineering Drawing: Shop Plan - Telegraph West Tower, Bridge 4 - Salmon Bay, Ballard, Washington, undated
- ItemBB025939 - Great Northern Engineering Drawing: Shop Plan - Telegraph West Tower, Bridge 4 - Salmon Bay, Ballard, Washington, undated
- 1410 more...