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Topic
- Oregon Agricultural College. Experiment Station 33
- Plants, Cultivated--Field experiments 24
- Sulfur fertilizers 24
- Nitrogen fertilizers 5
- Hens 3
- Knowlton, Frank L. (Frank Lester), 1894-1940 3
- Potassium fertilizers 3
- Poultry 3
- Universities and colleges--Faculty 3
- Irrigation 1
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Work Type
- black-and-white photographs 33
- photographic prints 33
- photographs 33
Rights
- No Copyright - United States 33
Local Collection Name
- Agricultural Experiment Station Photographic Collection, ca. 1900-1988 (P 029) 33
Format
- image/tiff 33
Decade
- 1920-1929 33