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- Oregon Agricultural College. Experiment Station 47
- Plants, Cultivated--Field experiments 25
- Sulfur fertilizers 24
- Nitrogen fertilizers 5
- Agriculture 4
- Graminaceae 4
- Harvesting 4
- Oregon Agricultural College 4
- Hens 3
- Knowlton, Frank L. (Frank Lester), 1894-1940 3
- Potassium fertilizers 3
- Poultry 3
- Universities and colleges--Faculty 3
- Vetch 3
- Agricultural machinery 2
- Cauthorn Hall 1
- College buildings 1
- Fairbanks Hall 1
- Farm buildings 1
- Fertilizers 1