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- Birds--Conservation 3
- Birds--Extinction 1
- Dams 1
- Eagles 1
- Fishes--Conservation 1
- Game and game-birds 1
- Geese 1
- National parks and reserves 1
- Oregon Wildlife Federation 1
- Pigeons 1
- Swans 1
- Turkey vulture 1
- Water--Pollution 1
- Wildlife refuges 1