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Topic
- Agricultural machinery 212
- Agriculture 57
- Agricultural laborers 36
- Burning of land 32
- Harvesting 30
- Strawberries 21
- Graminaceae 19
- Picketing 18
- Croplands 13
- Oregon State University. Extension Service 11
- Combines (Agricultural machinery) 9
- Oregon State University. Agricultural Experiment Station 8
- Peas 8
- Straw--Utilization 8
- Universities and colleges--Faculty 7
- Harvesting machinery 6
- Hay 6
- Horses 6
- Oregon State Agricultural College. Experiment Station 6
- Tractors 6