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Topic
- Lectures and lecturing 90
- Rivers--Oregon 17
- Dams 14
- Water--Pollution 11
- Salmon 10
- Birds--Conservation 9
- Fishes--Conservation 9
- Wildlife refuges 9
- Oregon Wildlife Federation 7
- Izaak Walton League of America 4
- Bears 3
- Beavers 3
- Fishways 3
- Hunting 3
- Agriculture 2
- Conservation of natural resources 2
- Conservation--Law and legislation 2
- Ducks 2
- Finley, William L., Jr. 2
- Fisheries 2