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
- 871 more...
- ItemBB022006 - Great Northern Engineering Drawing: Proposed Telegraph and Power Line, Bridge 12 - Swinomish Slough, West of Whitmarsh, Washington, undated
- ItemBB022007 - Great Northern Engineering Drawing: Suggested Collar Design, Bridge 12 - Swinomish Slough, West of Whitmarsh, Washington, undated
- ItemBB022008 - Great Northern Engineering Drawing: Modify Collar Design, Bridge 12 - Swinomish Slough, West of Whitmarsh, Washington, 1953
- ItemBB022009 - Great Northern Engineering Drawing: Location Electrical Equipment, Bridge 12 - Swinomish Slough, West of Whitmarsh, Washington, undated
- ItemBB022010 - Great Northern Engineering Drawing: PELEC Relay Housing, Bridge 12 - Swinomish Slough, West of Whitmarsh, Washington, undated
- ItemBB022011 - Great Northern Engineering Drawing: PELEC Relay Housing, Bridge 12 - Swinomish Slough, West of Whitmarsh, Washington, undated
- ItemBB022012 - Great Northern Engineering Drawing: PELEC Relay Housing, Bridge 12 - Swinomish Slough, West of Whitmarsh, Washington, undated
- ItemBB022013 - Great Northern Engineering Drawing: Electrical Conduit Layout, Bridge 12 - Swinomish Slough, West of Whitmarsh, Washington, undated
- ItemBB022014 - Great Northern Engineering Drawing: Load Center and Circuit Supply Number 1, Bridge 12 - Swinomish Slough, West of Whitmarsh, Washington, undated
- 3121 more...