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Topic
- Rivers--Oregon 46
- Dams 24
- Rivers--Washington (State) 15
- Fishways 7
- Boats 2
- Civilian Conservation Corps (U.S.) 2
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Region
- Multnomah County >> Oregon >> United States 46
- Columbia River >> Clatsop County >> Oregon >> United States 22
- Bonneville Dam >> Multnomah County >> Oregon >> United States 15
- Skamania County >> Washington >> United States 15
- Sandy River >> Multnomah County >> Oregon >> United States 14
- Bull Run River >> Clackamas County >> Oregon >> United States 4
- Little Sandy River >> Clackamas County >> Oregon >> United States 1
- Troutdale >> Multnomah County >> Oregon >> United States 1
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Institution
- Oregon State University 46