Population 379 Population studies (Demography) 185 History 158 Demography 135 Plant Propagation 111 Plant propagation 109 India 87 Ecology 84 Crop improvement 77 Economics 77 Sociology 61 Biography 60 plant layering 60 Population biology 59 Population genetics 59 plant harvesting 59 Agriculture 58 Genetics 58 Education 53 Politics and government 53 Population growth 45 Population policy 42 Rural development 42 population 42 Finance 40 Urbanization 39 Industries 38 Wildlife management 38 Communication 37 Economic development 37