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Topic
- Salmon 97
- Dams 50
- Rivers--Oregon 41
- Fishes--Conservation 28
- Fishing 17
- Lectures and lecturing 16
- Flood control 11
- Water--Pollution 10
- Fish hatcheries 7
- Fishways 6
- Bears 5
- Trout 5
- Hunting 4
- Islands--Alaska 4
- Waterfalls 4
- Wildlife refuges 4
- Birds--Conservation 3
- Finley, William L. (William Lovell), 1876-1953 3
- Seining 3
- Whaling 3