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Topic
- Birds--Conservation 4
- Wildlife refuges 4
- Wildlife management 1
Region
- Clear Lake National Wildlife Refuge >> Modoc County >> California >> United States 4
- Tule Lake National Wildlife Refuge >> Siskiyou County >> California >> United States 4
- Lower Klamath National Wildlife Refuge >> Siskiyou County >> California >> United States 3
- Upper Klamath National Wildlife Refuge >> Klamath County >> Oregon >> United States 3
- Malheur National Wildlife Refuge >> Harney County >> Oregon >> United States 2
Decade
- 1930-1939 4
