Population 379 Topology 245 Population studies (Demography) 185 Topology-- Mathematics 155 Demography 135 Topological and related algebra and groups 123 Mathematics 115 Algebraic topology 81 Ecology 78 History 75 Economics 68 Pomology 65 Sociology 63 General Topology-- Point set topology 61 Population biology 59 Population genetics 59 orchards 59 Genetics 56 Education 53 India 49 Agriculture 48 Population growth 45 Politics and government 44 Population policy 42 Rural development 42 population 42 Finance 40 Topology of spaces-- Manifold topology-- Metric topology 39 Industries 38 Urbanization 38