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- Grasses--Research 107
- Agriculture 99
- Universities and colleges--Faculty 41
- Tall fescue 18
- Self-pollination 14
- Ryegrasses 6
- Agronomic Crop Science 4
- Cowan, J. Ritchie (John Ritchie) 4
- Foote, Wilson H. 3
- Oregon State University. Agricultural Experiment Station 3
- Portraits, Group 3
- Mountains--Oregon 2
- Oregon State College. Agricultural Experiment Station 2
- Portraits 2
- Spraying and dusting in agriculture 1
