Limit your search
Topic
- Oregon Agricultural College. Experiment Station 43
- Plants, Cultivated--Field experiments 32
- Sulfur fertilizers 27
- Oregon State Agricultural College. Agricultural Experiment Station 12
- Potassium fertilizers 6
- Hens 5
- Knowlton, Frank L. (Frank Lester), 1894-1940 5
- Nitrogen fertilizers 5
- Tillage--Research 5
- Universities and colleges--Faculty 5
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Work Type
- photographic prints 59
- photographs 59
- black-and-white photographs 57
Local Collection Name
- Agricultural Experiment Station Photographic Collection, ca. 1900-1988 (P 029) 59
Format
- image/tiff 59
Decade
- 1920-1929 59