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Topic
- Plants, Cultivated--Field experiments 29
- Sulfur fertilizers 27
- Oregon Agricultural College. Experiment Station 25
- Potassium fertilizers 6
- Nitrogen fertilizers 5
- Fertilizers 1
- Phosphatic fertilizers 1
Work Type
- black-and-white photographs 29
- photographic prints 29
- photographs 29
Region
- Oregon >> United States 29
Local Collection Name
- Agricultural Experiment Station Photographic Collection, ca. 1900-1988 (P 029) 29
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