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- Agriculture 214
- Universities and colleges--Periodicals 169
- Oregon Agricultural College. Experiment Station 52
- Pears--Varieties 43
- Plants, Cultivated--Field experiments 34
- Agricultural experiment stations 31
- Croplands 31
- Sulfur fertilizers 28
- World War, 1939-1945 24
- Agricultural machinery 21
- Universities and colleges--Faculty 15
- Oregon State Agricultural College. Agricultural Experiment Station 14
- Orchards 13
- Foote, Wilson H. 12
- Oregon Agricultural College 10
- Livestock 9
- Vegetables 9
- Award presentations 8
- Alien plants 7
- Besse, Ralph S. (Ralph Stephen), 1887- 7
