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- Agriculture 5
- Demography 2
- Food 2
- Hunting 2
- Population 2
- Wildlife refuges 2
- Alsike clover 1
- Antelopes 1
- Bears 1
- Birds--Conservation 1
- Crops 1
- Economics 1
- Feathers 1
- Feed-water pumps 1
- Hawks 1
- Lakes--California 1
- Lakes--Oregon 1
- Livestock 1
- Migratory birds 1
- Mountains--Oregon 1