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- Locks (Hydraulic engineering) 9
- River engineering 8
- River surveys 7
- United States--Appropriations and expenditures 6
- Canals--Design and construction--Costs 3
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- Cascade Range 2
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Region
- Columbia River >> Clatsop County >> Oregon >> United States 9
- Willamette River >> Multnomah County >> Oregon >> United States 4
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- Cascade Locks >> Hood River County >> Oregon >> United States 3
- Portland >> Clackamas County >> Oregon >> United States 3
- The Dalles >> Wasco County >> Oregon >> 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
- Lewiston >> Nez Perce County >> Idaho >> United States 2
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- Text 6
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Decade
- 1890-1899 9