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Topic
- Lectures and lecturing 359
- Rivers--Oregon 36
- Dams 31
- Water--Pollution 20
- Wildlife refuges 20
- Conservation of natural resources 19
- Birds--Conservation 18
- Oregon Wildlife Federation 17
- Salmon 16
- Fishes--Conservation 13
- Izaak Walton League of America 10
- Hunting 8
- Bears 5
- Ducks 5
- Finley, William L., Jr. 4
- Poaching 4
- Sewage disposal plants 4
- Wildlife management 4
- Beavers 3
- Conservation--Law and legislation 3
