History 176 Politics and government 148 Heat 73 Philosophy 72 Education 58 Foreign relations 58 Social conditions 54 Literature 49 Social life and customs 43 Agriculture 42 Finance 42 Communication 40 Religion 40 Urbanization 39 Rural development 38 Scheduled tribes 38 Ethics 37 Industries 37 Population 37 Transportation 37 Language and literature 36 Non-governmental organizations 36 Tribes 36 Untouchables 36 Wildlife management 36 Tourist trade 35 Physics 33 Heat; Physics 32 Dissertations, Academic (Ph.D) 28 History and criticism 27