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Creator
- Oregon City Enterprise Courier (Oregon City, Or.) 4
- Oregon Journal (Firm) 2
- Oregonian (Firm) 2
- New York Times Company 1
Topic
- Salmon 4
- Dams 3
- Lectures and lecturing 3
- Water--Pollution 3
- Rivers--Oregon 2
- Fishes--Conservation 1
- Inland water transportation 1
Decade
- 1930-1939 4
