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- Wheat 255
- Croplands 123
- Agriculture 28
- Universities and colleges--Faculty 20
- Oregon State University. Extension Service 9
- Seedlings 8
- College students 7
- Crop and Soil Science 6
- Grasses--Seeds 6
- Kronstad, Warren E. (Warren Ervind), 1932- 6
- Universities and colleges--Employees 6
- Agricultural machinery 4
- Crops--Wounds and injuries 4
- Foote, Wilson H. 4
- Harvesting machinery 4
- Harvesting 4
- Aluminum 3
- Bullock, Richard M. (Richard Melvin), 1918- 3
- Clover 3
- Combines (Agricultural machinery) 3
