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Topic
- Barley 34
- Croplands 11
- College students 5
- Harvesting machinery 4
- Universities and colleges--Faculty 4
- Oats 3
- Agriculture 2
- Barley yellow dwarf viruses 2
- Population 2
- Economics 1
- Foote, Wilson H. 1
- Graduate students 1
- Oregon State University. Agricultural Experiment Station 1
- Precipitation (Meteorology) 1
- Rohde, Charles R. 1
- Sieveking, William Earl, 1932- 1
- Wheat 1
