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- Burning of land 86
- Agricultural machinery 32
- Agricultural laborers 12
- Cayuse Indians 8
- Croplands 8
- Indians of North America 8
- Portrait photography 8
- Indian women 7
- Forests and forestry 3
- Oregon State University 3
- Railroad tracks 3
- Soil science--Experiments 3
- Agriculture 2
- Corvallis (Or.) 2
- Lakes--Oregon 2
- Land use--Planning 2
- Lumber trade 2
- Oregon State Planning Board 2
- Oregon. Advisory Research Council 2
- Rivers--Oregon 2
