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
- 2804 more...
- ItemBB032633 - Spokane, Portland and Seattle Railway Engineering Drawing: Slough Crossing, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB032634 - Spokane, Portland and Seattle Railway Engineering Drawing: Centers of River Bottom, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB032635 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB032636 - Spokane, Portland and Seattle Railway Engineering Drawing: Probing Survey, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB032637 - Spokane, Portland and Seattle Railway Engineering Drawing: Survey, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- ItemBB032638 - Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, undated
- 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
- 1105 more...