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- American Field Service 24
- College students 18
- Universities and colleges--Faculty 8
- Universities and colleges--Alumni and alumnae 6
- Henderson, Robert W. (Robert Wesley), 1914-2006 4
- Oregon State University. Agricultural Experiment Station 4
- Dawson, M. D. 2
- Oregon State University. Memorial Union 2
- Soil Science 2
- Agricultural exhibitions 1
- Durham, Marvin Lyle, 1927- 1
- Graduate students 1