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- Rivers--Oregon 44
- Agriculture 23
- Watersheds 23
- Coarse woody debris 22
- Politics and government 22
- Hydrology 21
- Irrigation 16
- Precipitation (Meteorology) 16
- Groundwater 14
- Water-supply 14
- Climate 13
- Water diversion 12
- Building 10
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- Economics 10
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- Aswan High Dam (Egypt) 8
- Forest fires 8
- Technology 8
- Bureaucracy 7