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- Natural resources--Co-management 156
- Water-supply 133
- Water quality 126
- Water-power 99
- Infrastructure (Economics) 79
- Technical assistance 62
- Flood control 57
- 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 45
- Navigation 43
- Fishing 15
- Jurisdiction, Territorial 11
- Irrigation 6