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- Sprinkler irrigation 55
- Croplands 25
- Potatoes 3
- Waste products as fertilizer 3
- Peppermint 2
- Strawberries 2
- Bullock, Richard M. (Richard Melvin), 1918- 1
- Central Oregon Agricultural Research Center 1
- Grasses--Seeds 1
- Irrigation pumps 1
- Irrigation 1
- Oregon State University. Agricultural Experiment Station 1
- Pears 1
- Tractors 1
- Universities and colleges--Faculty 1
- Wheat 1
