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Topic
- Birds--Conservation 45
- Wildlife refuges 40
- Lectures and lecturing 18
- Rivers--Oregon 6
- Conservation of natural resources 3
- Salmon 3
- Water--Pollution 3
- Wildlife conservation 3
- Dams 2
- Fishing 2
- Hunting 2
- Izaak Walton League of America 2
- Migratory birds 2
- Oregon Wildlife Federation 2
- Parks 2
- Waterfowl 2
- Wildlife management 2
- Agriculture 1
- American Game Association 1
- Bears 1