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- Ryegrasses 37
- Croplands 17
- Agriculture 8
- Grasses--Research 6
- Alfalfa 3
- Farmers 3
- Universities and colleges--Faculty 3
- Weed control 3
- Weeds 3
- Herbicides 2
- Oregon State University. Extension Service 2
- Peppermint 2
- Hops 1
- Jackson, T. L. (Thomas Lloyd), 1922- 1
- King, Arthur Solomon, 1906-1972 1
- Seeds 1
- Strome, Carey L., 1894-1974 1
- Universities and colleges--Alumni and alumnae 1