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Topic
- Agriculture 73
- Oregon State University. Extension Service 15
- Harvesting 14
- Agricultural machinery 12
- Graminaceae 11
- Livestock 10
- Oregon State Agricultural College. Experiment Station 6
- Dairy cattle 5
- Dairy farming 5
- Wheat 5
- Chickens 4
- Railroad cars 4
- Sheep 4
- Cattle 3
- Celery 3
- Orchards 3
- Oregon Agricultural College. Experiment Station 3
- Pears 3
- Tractors 3
- Universities and colleges--Faculty 3