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- Oregon Agricultural College. Experiment Station 34
- Plants, Cultivated--Field experiments 29
- Sulfur fertilizers 28
- Croplands 21
- Agricultural machinery 17
- Agriculture 17
- Vegetables 8
- Experiments 7
- Livestock 7
- Orchards 7
- Oregon State Agricultural College. Agricultural Experiment Station 7
- Potassium fertilizers 6
- Universities and colleges--Faculty 6
- Wheat 6
- Flowering trees 5
- Nitrogen fertilizers 5
- Pasture plants 5
- Beans 4
- Cows 4
- Foote, Wilson H. 4