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Topic
- Agriculture 24
- Farm ownership 23
- Farms--Oregon 23
- Ranches--Oregon 4
- Wildlife refuges 3
- Dams 2
- Birds--Conservation 1
- Fishes--Conservation 1
- Hunting 1
- Lakes--California 1
- Lakes--Oregon 1
- Lectures and lecturing 1
- Mountains--Oregon 1
- National parks and reserves 1
- Rivers--California 1
- Rivers--Oregon 1
- Salmon 1
- Swans 1