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Topic
- Canals--Design and construction--Costs 1
- Dams--Design and construction 1
- Locks (Hydraulic engineering) 1
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Region
- Alsea River >> Lincoln County >> Oregon >> United States 1
- Asotin County >> Washington >> United States 1
- Astoria >> Clatsop County >> Oregon >> United States 1
- Bellingham Bay >> Whatcom County >> Washington >> United States 1
- Cascade Locks >> Hood River County >> Oregon >> United States 1
- Celilo Falls (historical) >> Wasco County >> Oregon >> United States 1
- Columbia River >> Clatsop County >> Oregon >> United States 1
- Coos River >> Coos County >> Oregon >> United States 1
- Cowlitz River >> Cowlitz County >> Washington >> United States 1
- Eugene >> Lane County >> Oregon >> United States 1
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