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Topic
- Dams--Design and construction 8
- Locks (Hydraulic engineering) 5
- Canals--Design and construction--Costs 3
- River engineering 3
- United States--Appropriations and expenditures 3
- West (U.S.) 3
- Salt River Indian Reservation (Ariz.) 2
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Region
- Portland >> Clackamas County >> Oregon >> United States 4
- Columbia River >> Clatsop County >> Oregon >> United States 3
- Willamette River >> Multnomah County >> Oregon >> United States 3
- Roosevelt >> Gila County >> Arizona >> United States 2
- Theodore Roosevelt Dam >> Gila County >> Arizona >> United States 2
- Yamhill River >> Yamhill County >> Oregon >> United States 2
- Clackamas Rapids >> Clackamas County >> Oregon >> United States 1
- Corvallis >> Benton County >> Oregon >> United States 1
- Lewiston >> Nez Perce County >> Idaho >> United States 1
- Oregon City >> Clackamas County >> Oregon >> United States 1
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Decade
- 1910-1919 8