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Topic
- United States. Department of Agriculture 95
- Universities and colleges--Faculty 47
- Hops 17
- Butz, Earl L. (Earl Lauer), 1909-2008 16
- Oregon State University. Agricultural Experiment Station 13
- Lawrence, F. J. (Francis J.) 11
- Harmond, Jesse E. (Jesse Edward), 1906- 9
- Hops--Diseases and pests 8
- Likens, Sam T. 8
- Agricultural Chemistry 7
- Dooley, Harrison L. 6
- Horticulture 6
- Park, Joseph Kenneth 5
- College presidents 4
- Food supply and war 4
- Laboratories--Equipment and supplies 4
- Mints (Plants) 4
- World War, 1914-1918--Posters 4
- World War, 1914-1918--Propaganda 4
- Agricultural Engineering 3
