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Topic
- Lectures and lecturing 16
- Rivers--Oregon 9
- Dams 5
- Water--Pollution 5
- Birds--Conservation 4
- Wildlife refuges 4
- Inland water transportation 2
- Izaak Walton League of America 2
- Salmon 2
- Bonneville Dam Fishways Committee 1
- Canned salmon 1
- Coyote 1
- Elk 1
- Fishes--Conservation 1
- Fishing 1
- Fishways 1
- General Wildlife Federation 1
- Hawks 1
- Hunting 1
- Irrigation 1
