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- Migratory birds 9
- Waterfowl 6
- Hunting 5
- Wildlife conservation 3
- Birds--Conservation 2
- Conservation of natural resources 2
- Rivers--Oregon 2
- Wildlife refuges 2
- Dams 1
- Flood control 1
- Game and game-birds 1
- Lakes--California 1
- Lakes--Oregon 1
- Lectures and lecturing 1
- Salmon 1
- Sewage disposal plants 1
- Water--Pollution 1
- Western Association of State Game and Fish Commissioners (U.S.) 1