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- Canals 159
- Irrigation 58
- Politics and government 50
- Building 38
- Agriculture 28
- Dams 27
- Finance 26
- Hydrology 24
- Water diversion 24
- Rivers 20
- River engineering 19
- Water-power 19
- Bureaucracy 18
- International regimes 18
- Northwest, Pacific 17
- United States. Congress--Records and correspondence 17
- Economics 16
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- Bodies of water 15
- Drainage 15