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- Barley 74
- Croplands 16
- Universities and colleges--Faculty 13
- Agriculture 7
- College students 5
- Crop and Soil Science 5
- Foote, Wilson H. 5
- Kronstad, Warren E. (Warren Ervind), 1932- 5
- Harvesting machinery 4
- Oats 3
- Barley yellow dwarf viruses 2
- Goetze, Norman R. (Norman Richard) 2
- Graduate students 2
- Grain 2
- Oregon State University. Agricultural Experiment Station 2
- Population 2
- Combines (Agricultural machinery) 1
- Crops 1
- Economics 1
- Hill, D. D. (Donald David), 1894- 1
