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- Politics and government 16
- Dams 14
- Soviet Union 14
- Agriculture 12
- Irrigation 12
- Water-power 12
- Aswan High Dam (Egypt) 8
- Groundwater 7
- Thawrah (Syria) 7
- Natural resources--Co-management 6
- Building 5
- Economics 5
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- Hydrology 3
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- Bibliography 2
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