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- Agricultural exhibitions 180
- Exhibitions 70
- Universities and colleges--Faculty 15
- Oregon Potato Commission 10
- Hazelnuts 9
- Oregon Wheat Commission 7
- 4-H clubs 6
- Coins 6
- Universities and colleges--Alumni and alumnae 6
- Bee culture 5
- Oregon State University. Agricultural Experiment Station 5
- Peach 5
- Umatilla County (Or.) 5
- Wheat 5
- Oregon State Capitol (Salem, Or. : 1938- ) 4
- Potatoes 4
- Women in agriculture 4
- Agricultural Chemistry 3
- Beef industry 3
- College teachers' spouses 3