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Topic
- Birds--Conservation 4
- Rivers--Oregon 4
- Wildlife refuges 4
- Salmon 3
- Dams 2
- Lectures and lecturing 2
- Izaak Walton League of America 1
- Parks 1
- Water--Pollution 1
Region
- Columbia River >> Clatsop County >> Oregon >> United States 4
- Malheur National Wildlife Refuge >> Harney County >> Oregon >> United States 3
- Blitzen Valley >> Harney County >> Oregon >> United States 1
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- Lower Klamath National Wildlife Refuge >> Siskiyou County >> California >> United States 1
Institution
- Oregon State University 4