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- Natural resources--Co-management 148
- Water-supply 128
- Water quality 123
- Water-power 96
- Infrastructure (Economics) 78
- Technical assistance 61
- Flood control 56
- Water boundaries 54
- 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
- Economic development 44
- Navigation 43
- Fishing 15
- Jurisdiction, Territorial 11
- Irrigation 6