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Topic
- Rivers 23
- Rivers--Washington (State) 8
- Waterfalls 5
- Dams 3
- Bridges 2
- Fish stocking 2
- Rivers--Idaho 2
- Capes (Coasts) 1
- Economics 1
- Fishways 1
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Region
- Clark County >> Washington >> United States 5
- Lewis River >> Cowlitz County >> Washington >> United States 4
- Chelan County >> Washington >> United States 2
- Columbia River >> Clatsop County >> Oregon >> United States 2
- Columbia River >> Douglas County >> Washington >> United States 2
- Elk Creek (United States >> Oregon) 2
- Nestucca River >> Tillamook County >> Oregon >> United States 2
- North Fork Payette River >> Boise County >> Idaho >> United States 2
- Payette River >> Payette County >> Idaho >> United States 2
- Valley County >> Idaho >> United States 2
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Institution
- Oregon State University 23
Decade
- 1930-1939 23