Population 379 Population studies (Demography) 185 Demography 137 Ecology 80 History 76 Birth control 73 Economics 69 Agriculture 65 Sociology 63 India 62 Population biology 59 Population genetics 59 Genetics 57 Education 53 Politics and government 52 Population growth 45 Hygiene 43 Population policy 42 population 42 Rural development 41 Urbanization 39 Finance 38 Industries 38 Scheduled tribes 38 Communication 37 Tribes 37 Wildlife management 37 Language and literature 36 Non-governmental organizations 36 Tourist trade 36