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- Oregon State University. Extension Service 6
- Agriculture 5
- Universities and colleges--Faculty 3
- 4-H clubs 1
- Agricultural machinery 1
- Animal feeding 1
- Cattle 1
- Cattle--Marking 1
- Graminaceae 1
- Hay 1
- Horses 1
- Jackman, E. R. (Edwin Russell), 1894-1967 1
- Mountains--Oregon 1
- Ranches 1