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Topic
- Lectures and lecturing 255
- Rivers--Oregon 35
- Dams 30
- Water--Pollution 20
- Wildlife refuges 18
- Birds--Conservation 17
- Salmon 16
- Fishes--Conservation 13
- Oregon Wildlife Federation 12
- Conservation of natural resources 7
- Hunting 7
- Izaak Walton League of America 7
- Bears 5
- Finley, William L., Jr. 4
- Poaching 4
- Sewage disposal plants 4
- Wildlife management 4
- Beavers 3
- Conservation--Law and legislation 3
- Ducks 3