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- Population 4
- Beans 3
- Farm produce 3
- Food prices 3
- Temperature 3
- Barley 2
- Croplands 2
- Oregon State University 2
- Chickens 1
- Drainage 1
- Food supply 1
- Grain 1
- Oregon State University. Agricultural Experiment Station 1
- Overpopulation 1
- Ponderosa pine 1
- Reproduction 1
- Research grants 1
- Roosters 1
- Signs and signboards 1
- Trees--Growth 1