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- Natural resources 40
- Water-supply 11
- Economic conditions 10
- International regimes 6
- Politics and government 6
- Agriculture 5
- Hydrology 4
- Technology 4
- Aquifers 3
- Irrigation 3
- Watersheds 3
- Contamination of environment 2
- Demography 2
- Economics 2
- Groundwater 2
- Hydrogeology 2
- Natural Resources 2
- Negotiation 2
- Occupied territories 2
- Population 2
