Railroad Archives Online
- CollectionD0027 - Timothy Miller Collection
- Series007 - Spokane, Portland, and Seattle Railway
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3001 - Bridges
- 2810 more...
- ItemBB032639 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB032640 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB032641 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB032642 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB032643 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB032644 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB032645 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB032646 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB032647 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- 1099 more...