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- Agricultural machinery 18
- Agriculture 44
- Agronomic Crop Science 1
- Artichokes 1
- Barns 1
- Bulls 1
- Combines (Agricultural machinery) 1
- Cowan, J. Ritchie (John Ritchie) 1
- Graminaceae 23
- Grasses--Research 12
- Grasses--Seeds 1
- Harvesting 21
- Hay 3
- Irrigation 1
- Oregon Agricultural College. Experiment Station 7
- Oregon State Agricultural College. Experiment Station 7
- Oregon State College. Agricultural Experiment Station 1
- Phormium 2
- Portraits, Group 3
- Scales (Weighing instruments) 1