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Creator
- Oregonian (Firm) 41
- Oregon Journal (Firm) 23
- Oregon City Enterprise Courier (Oregon City, Or.) 5
- Portland Chamber of Commerce (Or.) 3
- Billings Gazette 2
- Grants Pass Daily Courier 2
- Izaak Walton League of America 2
- Santa Barbara News-Press 2
- Berkeley Daily Gazette (Berkeley, Cal.) 1
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Topic
- Water--Pollution 41
- Rivers--Oregon 37
- Lectures and lecturing 14
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- Dams 7
- Fishes--Conservation 7
- Izaak Walton League of America 7
- Salmon 5
- Conservation--Law and legislation 3
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Region
- Willamette River >> Multnomah County >> Oregon >> United States 22
- Portland >> Washington County >> Oregon >> United States 10
- Columbia River >> Clatsop County >> Oregon >> United States 8
- Rogue River >> Curry County >> Oregon >> United States 4
- Alaska >> United States 3
- Malheur National Wildlife Refuge >> Harney County >> Oregon >> United States 2
- Clackamas River >> Clackamas County >> Oregon >> United States 1
- Corvallis >> Benton County >> Oregon >> United States 1
- Jennings Lodge >> Clackamas County >> Oregon >> United States 1
- P Ranch >> Harney County >> Oregon >> United States 1
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