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- Oregon Agricultural College. Experiment Station 44
- Plants, Cultivated--Field experiments 32
- Sulfur fertilizers 27
- Oregon State Agricultural College. Agricultural Experiment Station 13
- Potassium fertilizers 6
- Nitrogen fertilizers 5
- Tillage--Research 5
- Hens 3
- Knowlton, Frank L. (Frank Lester), 1894-1940 3
- Poultry 3
- Universities and colleges--Faculty 3
- Agriculture 2
- Experiments 2
- Sheep--Diseases 2
- Irrigation 1
- Phosphatic fertilizers 1
- Shaw, J. N. (James Niven), 1890- 1