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Topic
- Oregon Agricultural College. Experiment Station 16
- Plants, Cultivated--Field experiments 12
- Sulfur fertilizers 12
- Hens 2
- Knowlton, Frank L. (Frank Lester), 1894-1940 2
- Oregon State Agricultural College. Agricultural Experiment Station 2
- Poultry 2
- Universities and colleges--Faculty 2
- Nitrogen fertilizers 1
- Potassium fertilizers 1
Work Type
- black-and-white photographs 16
- photographic prints 16
- photographs 16
Region
- Oregon >> United States 16
Language
- English 16
Format
- image/tiff 16