Journal Article Historical Article 964 Biography 458 English Abstract 353 Demographic Factors 37 Population 37 Population Dynamics 33 Portrait 33 Developed Countries 28 Europe 26 Economic Factors 25 Western Europe 21 Socioeconomic Factors 17 Migration 16 Research Methodology 16 Germany, Federal Republic Of 15 Comparative Study 11 Family And Household 9 Geographic Factors 9 International Migration 9 Policy 9 Population Characteristics 9 Research Support, Non-U.S. Gov't 9 Developing Countries 8 Fertility 8 World 8 Age Factors 7 Behavior 7 Bibliography 7 Family Characteristics 7