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- Oregon Agricultural College. Experiment Station 52
- Plants, Cultivated--Field experiments 24
- Sulfur fertilizers 24
- Oregon State Agricultural College. Agricultural Experiment Station 11
- Agriculture 5
- Harvesting 5
- Nitrogen fertilizers 5
- Graminaceae 4
- Universities and colleges--Faculty 4
- Agricultural machinery 3
- Hens 3
- Knowlton, Frank L. (Frank Lester), 1894-1940 3
- Potassium fertilizers 3
- Poultry 3
- Agriculture Hall 1
- Entomology 1
- Food industry and trade 1
- Grading 1
- Irrigation 1
- Jardine, James T. (James Tertius), 1881-1954 1