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Topic
- Rivers--Oregon 47
- Dams 30
- Water--Pollution 20
- Flood control 16
- Lectures and lecturing 14
- Fishes--Conservation 13
- Salmon 13
- Sewage disposal plants 5
- Inland water transportation 4
- Izaak Walton League of America 4
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Region
- Willamette River >> Multnomah County >> Oregon >> United States 47
- Columbia River >> Clatsop County >> Oregon >> United States 11
- Portland >> Washington County >> Oregon >> United States 5
- Santiam River >> Marion County >> Oregon >> United States 5
- Alaska >> United States 3
- McKenzie River >> Lane County >> Oregon >> United States 3
- Bonneville Dam >> Multnomah County >> Oregon >> United States 2
- Corvallis >> Benton County >> Oregon >> United States 1
- Grand Coulee Dam >> Okanogan County >> Washington >> United States 1
- Rogue River >> Curry County >> Oregon >> United States 1
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