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Topic
- Oregon Agricultural College. Experiment Station 24
- Plants, Cultivated--Field experiments 24
- Sulfur fertilizers 24
- Nitrogen fertilizers 5
- Potassium fertilizers 3
- Phosphatic fertilizers 1
Work Type
- black-and-white photographs 24
- photographic prints 24
- photographs 24
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- No Copyright - United States 24
Format
- image/tiff 24
Decade
- 1920-1929 24