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Topic
- Dams 20
- Fishes--Conservation 20
- Rivers--Oregon 17
- Salmon 15
- Flood control 12
- Lectures and lecturing 3
- Water--Pollution 3
- Lakes--Oregon 2
- Bandon, Eliza 1
- Birds--Conservation 1
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Region
- Willamette River >> Multnomah County >> Oregon >> United States 16
- Columbia River >> Clatsop County >> Oregon >> United States 8
- McKenzie River >> Lane County >> Oregon >> United States 2
- Santiam River >> Marion County >> Oregon >> United States 2
- Wallowa Lake >> Wallowa County >> Oregon >> United States 2
- Clackamas River >> Clackamas County >> Oregon >> United States 1
- Portland >> Washington County >> Oregon >> United States 1
Decade
- 1940-1949 20