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Topic
- Rivers--Oregon 48
- Dams 27
- Salmon 18
- Water--Pollution 12
- Lectures and lecturing 11
- Inland water transportation 8
- Fishes--Conservation 7
- Izaak Walton League of America 7
- Killer whale 6
- Birds--Conservation 5
- Hunting 5
- Sewage disposal plants 4
- Wildlife refuges 4
- Ducks 2
- Finley, William L. (William Lovell), 1876-1953 2
- Fishing 2
- Fishways 2
- Agriculture 1
- Bears 1
- Beavers 1