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Topic
- Rivers--Oregon 14
- Dams 5
- Fishways 5
- Waterfalls 4
- Forests and forestry 2
- Lumber trade 2
- Water-wheels 2
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- Steam-engines 1
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Region
- Tualatin River >> Clackamas County >> Oregon >> United States 14
- Willamette River >> Multnomah County >> Oregon >> United States 14
- Washington County >> Oregon >> United States 13
- Gales Creek >> Washington County >> Oregon >> United States 7
- Glenwood Park >> Multnomah County >> Oregon >> United States 2
- Clackamas County >> Oregon >> United States 1
- Tualatin >> Washington County >> Oregon >> United States 1
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Decade
- 1940-1949 14