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- Oregon Agricultural College. Experiment Station 15
- Universities and colleges--Faculty 13
- Plants, Cultivated--Field experiments 12
- Sulfur fertilizers 12
- Agricultural exhibitions 11
- Universities and colleges--Alumni and alumnae 5
- Exhibitions 4
- Oregon State University. Agricultural Experiment Station 4
- Wood, G. B. (Gregory Burton), 1909- 4
- College presidents 3
- MacVicar, Robert William, 1918- 3
- Universities and colleges--Employees 3
- Agricultural machinery 2
- Building--Planning 2
- Burning of land 2
- Crop and Soil Science 2
- Deans (Education) 2
- Fendall, Roger Kenneth 2
- Hens 2
- Knowlton, Frank L. (Frank Lester), 1894-1940 2