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- Agriculture 119
- Oregon State University. Extension Service 29
- Harvesting 19
- Agricultural machinery 15
- Livestock 15
- Graminaceae 13
- 4-H clubs 8
- Cattle 7
- Wheat 7
- Orchards 6
- Oregon State Agricultural College. Experiment Station 6
- Sheep 6
- Dairy cattle 5
- Dairy farming 5
- Oregon Agricultural College. Experiment Station 5
- Railroad cars 5
- Chickens 4
- Horticulture 4
- Pears 4
- Portraits, Group 4