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- Hops 290
- Barley 33
- Agriculture 20
- Universities and colleges--Faculty 12
- Beer 11
- Brewing 8
- Agricultural implements 6
- Scientific apparatus and instruments 6
- Congresses and conventions 5
- Portraits, Group 5
- Crop and Soil Science 4
- Foote, Wilson H. 4
- Kronstad, Warren E. (Warren Ervind), 1932- 4
- Pests 4
- Exhibitions 3
- Food processing machinery 3
- Food--Drying 3
- Food--Research 3
- Harvesting 3
- Insects 3