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Topic
- Birds--Conservation 2
- Dams 2
- Lectures and lecturing 2
- Rivers--Oregon 2
- Salmon 2
- Scientific expeditions 2
- Wildlife refuges 2
- Agriculture 1
- Beavers 1
- Bobcat 1
- Bonneville Dam Fishways Committee 1
- California Oregon Power Company 1
- Canned salmon 1
- Fishing 1
- Fishways 1
- Foxes 1
- Islands--Alaska 1
- Nature photography 1
- Psaltriparus 1
- Puma 1