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Topic
- Dams 13
- Rivers--Oregon 13
- Sawmills 4
- Fishways 3
- Flumes 1
- Hydroelectric power plants 1
- Lumber trade 1
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Region
- Lane County >> Oregon >> United States 13
- Willamette River >> Multnomah County >> Oregon >> United States 11
- McKenzie River >> Lane County >> Oregon >> United States 3
- Long Tom River >> Benton County >> Oregon >> United States 2
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Institution
- Oregon State University 13