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- Oregon State University. Extension Service 8
- Agriculture 4
- Universities and colleges--Faculty 4
- Cattle 2
- Livestock 2
- Universities and colleges--Alumni and alumnae 2
- Weights and measures 2
- Wheat 2
- Graminaceae 1
- Horses 1
- King, Arthur Solomon, 1906-1972 1
- Trails 1
- Weatherford, Marion T. 1