Population History 91 Social conditions 50 Demography 48 Economic conditions 48 Economic aspects 34 Fertility, Human 34 more ... Population policy 30 Population forecasting 23 Environmental aspects 21 Emigration and immigration 18 Birth control 17 Social aspects 16 Vital statistics 16 Demographic transition 15 Ethnic relations 15 Sustainable development 14 Demographic surveys 13 Marriage 13 Migration, Internal 13 Mortality 13 Economic development 11 Forecasting 10 Government policy 10 Hispanic Americans 10 Medical care 10 Race relations 10 Ethnology 9 Families 9 Indians of North America 9 less ...