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- Oregon State University. Extension Service 25
- Agriculture 16
- Agricultural machinery 6
- Universities and colleges--Faculty 5
- Hops 4
- Harvesting 3
- Home economics 3
- 4-H clubs 2
- Exhibitions 2
- Forest fires--Prevention and control 2
- Livestock 2
- Mexican American agricultural laborers 2
- Parades 2
- Wool 2
- Agricultural laborers 1
- Agricultural laborers--Housing 1
- Animals in logging 1
- Automobiles 1
- Barns 1
- Beavers 1