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- Agriculture 1717
- Farm ownership 328
- Universities and colleges--Periodicals 169
- Oregon State Fair 168
- Oregon State University. Extension Service 164
- Farm tenancy--Economic aspects 163
- Farms--Oregon 148
- Harvesting 148
- Universities and colleges--Faculty 101
- Grasses--Research 99
- Agricultural laborers 80
- Orchards 78
- Cattle 69
- Ranches--Oregon 62
- Agricultural machinery 61
- Hops 61
- Portraits, Group 55
- Livestock 42
- Graminaceae 36
- Sheep 35