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Creator
- United States. Army. Office of the Chief of Engineers 9
Topic
- Locks (Hydraulic engineering) 9
- River engineering 9
- United States--Appropriations and expenditures 9
- River surveys 6
- Canals--Design and construction--Costs 5
- Dams--Design and construction 4
- West (U.S.) 3
- Bodies of water 1
- Cascade Range 1
- Railroad engineering 1
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Region
- Columbia River >> Clatsop County >> Oregon >> United States 9
- Willamette River >> Multnomah County >> Oregon >> United States 6
- The Dalles >> Wasco County >> Oregon >> United States 4
- Astoria >> Clatsop County >> Oregon >> United States 3
- Cascade Locks >> Hood River County >> Oregon >> United States 3
- Portland >> Clackamas County >> Oregon >> United States 3
- Vancouver >> Clark County >> Washington >> United States 3
- Yamhill River >> Yamhill County >> Oregon >> United States 3
- Celilo Falls (historical) >> Wasco County >> Oregon >> United States 2
- Cowlitz River >> Cowlitz County >> Washington >> United States 2
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License
- Creative Commons: Public Domain Mark 1.0 9
Type
- Text 7
- Collection 2