Social classes 199 History 141 Social Sciences 94 Caste 91 India 90 Literature 88 Dissertations, Academic (Ph.D) 73 Working class 65 Social conditions 62 Chaotic behavior in systems 55 Sociology 53 Novel 49 Social classes-- Social stratification-- Sociology 44 Mathematics 41 Middle class 41 Women 41 Politics and government 40 Economics 38 Education 38 Social Class 36 Social Classes 33 Literature Malayalam 32 Sanskrit drama 31 Capitalism 30 Dalits 30 Management 30 English literature 29 Literature Sanskrit 29 Social aspects 29 History and criticism 27