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Topic
Groundwater
4
Hydrology
4
Irrigation
4
Agriculture
2
Bibliography
2
Watersheds
2
Dams
1
Demography
1
Economics
1
Food
1
Imports
1
Nasser, Lake (Egypt and Sudan)
1
Politics and government
1
Reservoirs
1
Resource allocation
1
Rivers
1
Saline water conversion
1
Sewage
1
Technology
1
Water quality
1