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- Natural resources--Co-management 132
- Water-supply 123
- Water quality 114
- Water-power 91
- Infrastructure (Economics) 61
- Technical assistance 56
- Flood control 51
- Water boundaries 51
- Indian agents 46
- Indians of North America--Oregon 46
- Indians of North America--Treaties 46
- Oregon Territory--History 46
- United States. Office of Indian Affairs. Oregon Superintendency 46
- Navigation 41
- Economic development 39
- Fishing 15
- Jurisdiction, Territorial 10
- Irrigation 6