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Topic
- United States. Department of Agriculture 35
- Universities and colleges--Faculty 24
- Hops 8
- Oregon State University. Agricultural Experiment Station 8
- Harmond, Jesse E. (Jesse Edward), 1906- 7
- Dooley, Harrison L. 6
- Horticulture 6
- Lawrence, F. J. (Francis J.) 6
- Laboratories--Equipment and supplies 4
- Park, Joseph Kenneth 4
- Chemists 3
- Likens, Sam T. 3
- Mints (Plants) 3
- Roses 3
- Agricultural Chemistry 2
- Apples 2
- Hops--Diseases and pests 1
- Plant diseases 1
- Portraits 1
- United States. Environmental Protection Agency 1