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- Oregon Agricultural College. Experiment Station 20
- Plants, Cultivated--Field experiments 17
- Sulfur fertilizers 12
- Oregon State Agricultural College. Agricultural Experiment Station 5
- Tillage--Research 5
- Hens 2
- Knowlton, Frank L. (Frank Lester), 1894-1940 2
- Poultry 2
- Sheep--Diseases 2
- Universities and colleges--Faculty 2
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Work Type
- black-and-white photographs 27
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Decade
- 1920-1929 27