Population 34 Rural Population 15 Dissertations 13 Dissertations, Academic 13 Fish populations 7 Fertility, Human 5 Migration, Internal 5 Statistics 5 Aged 4 Demography 4 Population density 4 Social conditions 4 Urban Population 4 Birth control 3 Economic aspects 3 Ethnic Groups 3 Genetics 3 History 3 Population genetics 3 Population policy 3 Statistics, Vital 3 Women 3 Animal population genetics 2 Birds 2 Breast Feeding 2 Delivery 2 Ecology 2 Education 2 Effect of habitat modification on 2 Environmental aspects 2