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- Agricultural exhibitions 68
- Universities and colleges--Faculty 12
- Irrigation 6
- Oregon State University. Extension Service 6
- Universities and colleges--Employees 5
- Oregon State University. School of Agriculture 4
- Crop and Soil Science 3
- Methane 3
- Projectors 3
- Anderson, D. E. (Donald Eugene) 2
- Boersma, L. 2
- Business Administration 2
- Douglas County (Or.) 2
- Geodesic domes 2
- Labor unions--Officials and employees 2
- Oregon State University 2
- Rudd, Oris Clark 2
- Shannon, Edfred Loren 2
- Strickler, Lester Braden 2
- Universities and colleges--Alumni and alumnae 2