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Topic
- Agriculture 44
- Graminaceae 23
- Harvesting 21
- Agricultural machinery 18
- Grasses--Research 12
- Universities and colleges--Faculty 8
- Oregon Agricultural College. Experiment Station 7
- Oregon State Agricultural College. Experiment Station 7
- Hay 3
- Portraits, Group 3
- Tall fescue 3
- Vetch 3
- Phormium 2
- Sowing--Equipment and supplies 2
- Tractors 2
- Agronomic Crop Science 1
- Artichokes 1
- Barns 1
- Bulls 1
- Combines (Agricultural machinery) 1
