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Topic
- Wildlife conservation 10
- Birds--Conservation 3
- Hunting 3
- Migratory birds 3
- Wildlife refuges 3
- Conservation of natural resources 2
- Forests and forestry 2
- Game and game-birds 2
- Izaak Walton League of America 2
- Lakes--Oregon 2
- Rivers--Oregon 2
- Water--Pollution 2
- Waterfowl 2
- Agriculture 1
- American bison 1
- Burning of land 1
- Conservation of natural resources--Law and legislation 1
- Dams--Design and construction 1
- Fishes--Conservation 1
- Fishing 1