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- Food supply 29
- Agriculture 11
- Population 6
- Irrigation 5
- Economics 4
- Politics and government 3
- Aquaculture 2
- Armed Forces 2
- Bureaucracy 2
- Demography 2
- Exports 2
- Grain 2
- Imports 2
- Industries 2
- Overpopulation 2
- Building 1
- Canals 1
- Commerce 1
- Dams 1
- Dead Sea (Israel and Jordan) 1
