Population History 377 Economic conditions 213 Social conditions 197 Demography 154 Economic aspects 133 Birth control 112 espandi ... Fertility, Human 111 Population policy 103 Population forecasting 68 Economic development 66 Emigration and immigration 66 Environmental aspects 65 Migration, Internal 61 Social aspects 55 Poblacion 51 Ethnic relations 43 Race relations 42 Cities and towns 41 Demographic transition 40 Politics and government 40 African Americans 39 Food supply 39 Mortality 36 Natural resources 35 Minorities 32 Sustainable development 31 Agriculture 30 Ethnology 30 Urbanization 30 riduci ...