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Topic
- Birds--Conservation 54
- Wildlife refuges 44
- Lectures and lecturing 18
- Rivers--Oregon 6
- Water--Pollution 4
- Agriculture 3
- Conservation of natural resources 3
- Dams 3
- Hawks 3
- Oregon Wildlife Federation 3
- Salmon 3
- Wildlife conservation 3
- Fishes--Conservation 2
- Fishing 2
- Game and game-birds 2
- Hunting 2
- Izaak Walton League of America 2
- Migratory birds 2
- Parks 2
- Turkey vulture 2