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- Agriculture 156
- Grasses--Research 107
- Universities and colleges--Faculty 57
- Graminaceae 34
- Agricultural machinery 28
- Harvesting 27
- Tall fescue 24
- Portraits, Group 16
- Meetings 14
- Portraits 14
- Self-pollination 14
- Oregon Agricultural College. Experiment Station 7
- Oregon State Agricultural College. Experiment Station 7
- Ryegrasses 6
- Agronomic Crop Science 4
- Cowan, J. Ritchie (John Ritchie) 4
- Foote, Wilson H. 4
- Oregon State University. Agricultural Experiment Station 4
- Cattle 3
- Hay 3