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- Croplands 48
- Farmers 39
- Harvesting machinery 29
- Combines (Agricultural machinery) 24
- Universities and colleges--Alumni and alumnae 19
- Sprinkler irrigation 13
- Agricultural machinery 11
- Barley 9
- Peas 8
- Agricultural laborers 6
- Mexican American agricultural laborers 6
- Agriculture 5
- Universities and colleges--Faculty 4
- College students 3
- Farm buildings 3
- Farm ownership 3
- Farm tenancy--Economic aspects 3
- Farms--Oregon 3
- Oregon State University. Agricultural Experiment Station 3
- Oregon State University. Extension Service 3