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Topic
- Harvesting 21
- Agriculture 20
- Graminaceae 19
- Agricultural machinery 16
- Oregon Agricultural College. Experiment Station 7
- Oregon State Agricultural College. Experiment Station 7
- Vetch 3
- Hay 2
- Tractors 2
- Artichokes 1
- Combines (Agricultural machinery) 1
- Oregon State College. Agricultural Experiment Station 1
- Scales (Weighing instruments) 1
- Sunflowers 1
