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Topic
- Rivers--Oregon 170
- Dams 91
- Fishways 33
- Canals 16
- Salmon 16
- Hydroelectric power plants 13
- Power-plants 9
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- Waterfalls 7
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Region
- Willamette River >> Multnomah County >> Oregon >> United States 174
- Linn County >> Oregon >> United States 78
- Marion County >> Oregon >> United States 56
- Santiam River >> Marion County >> Oregon >> United States 48
- Yamhill County >> Oregon >> United States 22
- Yamhill River >> Yamhill County >> Oregon >> United States 22
- Calapooia River >> Linn County >> Oregon >> United States 17
- Tualatin River >> Clackamas County >> Oregon >> United States 14
- Clackamas County >> Oregon >> United States 13
- South Yamhill River >> Yamhill County >> Oregon >> United States 13
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Rights
- In Copyright 174
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- image/tiff 174
Collection
- Pacific Northwest Stream Survey 174
Decade
- 1940-1949 174