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- Harvesting 27
- Agriculture 26
- Graminaceae 25
- Agricultural machinery 22
- Oregon Agricultural College. Experiment Station 7
- Oregon State Agricultural College. Experiment Station 7
- Vetch 3
- Hay 2
- Tall fescue 2
- Tractors 2
- Artichokes 1
- Combines (Agricultural machinery) 1
- Oregon State College. Agricultural Experiment Station 1
- Scales (Weighing instruments) 1
- Sunflowers 1
- Universities and colleges--Faculty 1