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Topic
- Dams 223
- Rivers--Oregon 97
- Rivers--Washington (State) 74
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- Chinook salmon 15
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Region
- Columbia River >> Clatsop County >> Oregon >> United States 96
- Chelan County >> Washington >> United States 67
- Columbia River >> Douglas County >> Washington >> United States 60
- Willamette River >> Multnomah County >> Oregon >> United States 54
- Payette River >> Payette County >> Idaho >> United States 15
- Bonneville Dam >> Multnomah County >> Oregon >> United States 13
- Lane County >> Oregon >> United States 13
- Santiam River >> Marion County >> Oregon >> United States 13
- Weiser River >> Washington County >> Idaho >> United States 13
- Black Canyon Dam >> Gem County >> Idaho >> United States 10
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Institution
- Oregon State University 223
Decade
- 1930-1939 223