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Creator
- Oregon State University. Agricultural Experiment Station 27
Topic
- Plants, Cultivated--Field experiments 27
- Sulfur fertilizers 27
- Oregon Agricultural College. Experiment Station 24
- Potassium fertilizers 6
- Nitrogen fertilizers 5
- Phosphatic fertilizers 1
Work Type
- black-and-white photographs 27
- photographic prints 27
- photographs 27
Format
- image/tiff 27
Decade
- 1920-1929 27