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Topic
- Rivers--Oregon 17
- Dams 12
- Flood control 8
- Fishes--Conservation 7
- Water--Pollution 7
- Salmon 6
- Lectures and lecturing 4
- Izaak Walton League of America 3
- Sewage disposal plants 3
- Irrigation 2
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Region
- Willamette River >> Multnomah County >> Oregon >> United States 15
- Columbia River >> Clatsop County >> Oregon >> United States 5
- Portland >> Washington County >> Oregon >> United States 4
- Santiam River >> Marion County >> Oregon >> United States 3
- McKenzie River >> Lane County >> Oregon >> United States 2
- Rogue River >> Curry County >> Oregon >> United States 2
- Clackamas River >> Clackamas County >> Oregon >> United States 1
- Jennings Lodge >> Clackamas County >> Oregon >> United States 1
- Mexico >> North America 1
- Tillamook >> Tillamook County >> Oregon >> United States 1
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Decade
- 1940-1949 17