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Topic
- Agriculture 44
- Graminaceae 22
- Harvesting 20
- Agricultural machinery 18
- Grasses--Research 11
- Oregon State Agricultural College. Experiment Station 7
- Universities and colleges--Faculty 7
- Oregon Agricultural College. Experiment Station 6
- Hay 3
- Portraits, Group 3
- Tall fescue 3
- Vetch 3
- Sowing--Equipment and supplies 2
- Tractors 2
- Artichokes 1
- Barns 1
- Bulls 1
- Combines (Agricultural machinery) 1
- Grasses--Seeds 1
- Irrigation 1
