Demography Population 44 Methodology 12 Mathematical models 11 Population forecasting 8 Statistics 8 Congresses 7 Study and teaching 6 Case studies 5 History 4 Bibliography 3 Directories 3 Population research 3 Data processing 2 Economic development 2 Estimates 2 Migration, Internal 2 Abstracts 1 Anthropology 1 Birth control 1 Books 1 Brain drain 1 Census 1 Classification 1 Classification, Universal decimal 1 Computer programs 1 Criminal statistics 1 Cross-cultural studies 1 Dictionaries 1 Dictionaries, Polyglot 1