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- Rivers--Oregon 29
- Coarse woody debris 14
- Agriculture 8
- Forest fires 8
- Oregon State University. Extension Service 8
- Universities and colleges--Faculty 8
- Sheep 7
- Bridges 5
- Pastures 5
- Roads 5
- Clover 4
- Farm ownership 4
- Farm tenancy--Economic aspects 4
- Soil Science 4
- Dawson, M. D. 3
- Farms 3
- Forests and forestry 3
- Incinerators 3
- Mosher, Wayne Delbert 3
- Tunnels 3