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Topic
- Sulfur fertilizers 28
- Plants, Cultivated--Field experiments 27
- Oregon Agricultural College. Experiment Station 24
- Potassium fertilizers 6
- Nitrogen fertilizers 5
- Alfalfa 1
- Croplands 1
- Phosphatic fertilizers 1
Local Collection Name
- Agricultural Experiment Station Photographic Collection, ca. 1900-1988 (P 029) 28
Format
- image/tiff 28