Population studies (Demography) 9 International economics-- Report 8 Economic development-- Economic Planning 4 Agricultural economics 3 Economics 3 International commerce 3 Income and expense management-- Financial management 2 Labor force-- Labor economics 2 Age distribution (Demography) 1 Altersstruktur 1 Altersversorgung 1 Aspect social 1 Aspect économique 1 Bevölkerungsentwicklung 1 Calamitous sand dust storms 1 Drylands 1 Dust and Sandstorms 1 Dust bowl 1 Développement économique 1 Economic aspects 1 Economic development 1 Economic survey 1 Environment control 1 Espérance de vie 1 Health, mortality 1 International Economics 1 Investments-- Report 1 Law 1 Mortality, Health 1 Population 1