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- Agriculture 1592
- Oregon State Fair 178
- Livestock 172
- Farm ownership 170
- Oregon State University. Extension Service 164
- Harvesting 148
- Cattle 133
- Universities and colleges--Faculty 101
- Grasses--Research 99
- Agricultural laborers 89
- Orchards 82
- Animal culture 75
- Domestic animals 70
- Agricultural machinery 66
- Sheep 65
- Hops 64
- Portraits, Group 58
- Farms 43
- Pastures 39
- Graminaceae 36