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Topic
- Dams--Design and construction 2
- Locks (Hydraulic engineering) 2
- River engineering 2
- River surveys 1
- United States--Appropriations and expenditures 1
- West (U.S.) 1
Region
- Oregon City >> Clackamas County >> Oregon >> United States 2
- Yamhill River >> Yamhill County >> Oregon >> United States 2
- Astoria >> Clatsop County >> Oregon >> United States 1
- Clackamas Rapids >> Clackamas County >> Oregon >> United States 1
- Columbia River >> Clatsop County >> Oregon >> United States 1
- Corvallis >> Benton County >> Oregon >> United States 1
- Portland >> Clackamas County >> Oregon >> United States 1
- Willamette River >> Multnomah County >> Oregon >> United States 1
Institution
- University of Oregon 2