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- Emigration and immigration 35
- Demography 26
- Politics and government 17
- Economics 15
- Population 7
- Labor 6
- Agriculture 4
- Irrigation 4
- Palestinian Arabs 4
- Water-power 4
- Aquifers 3
- Armed Forces 3
- International regimes 3
- Religion 3
- Armistices 2
- Building 2
- Bureaucracy 2
- Employment 2
- Fertility 2
- Foreign relations 2
