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Topic
- Agriculture 33
- Farm ownership 28
- Farm tenancy--Economic aspects 28
- Farms--Oregon 23
- Ranches--Oregon 5
- Wildlife refuges 5
- Lakes--Oregon 4
- Lakes--California 3
- United States. Bureau of Biological Survey 3
- Birds--Conservation 2
- Burning of land 2
- Forests and forestry 2
- Land use--Planning 2
- Oregon State Planning Board 2
- Oregon. Advisory Research Council 2
- Rivers--Oregon 2
- Soil erosion 2
- Stream conservation 2
- Water--Pollution 2
- Advisory Committee on Rural Land Zoning 1