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Topic
- Dams 16
- Fishes--Conservation 16
- Rivers--Oregon 16
- Flood control 12
- Salmon 12
- Lectures and lecturing 3
- Water--Pollution 2
- Bandon, Eliza 1
- Fishways 1
- Irrigation 1
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Region
- Willamette River >> Multnomah County >> Oregon >> United States 16
- Columbia River >> Clatsop County >> Oregon >> United States 7
- McKenzie River >> Lane County >> Oregon >> United States 2
- Santiam River >> Marion County >> Oregon >> United States 2
- Clackamas River >> Clackamas County >> Oregon >> United States 1
- Portland >> Washington County >> Oregon >> United States 1
Decade
- 1940-1949 16
