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- Harvesting 20
- Agriculture 19
- Agricultural machinery 15
- Graminaceae 14
- Oregon State Agricultural College. Experiment Station 6
- Oregon Agricultural College. Experiment Station 5
- Hay 2
- Tractors 2
- Apples 1
- Artichokes 1
- Combines (Agricultural machinery) 1
- Hops 1
- Oregon State University. Extension Service 1
- Scales (Weighing instruments) 1
- Sunflowers 1
- Vetch 1
- Wheat 1