English language 148 History 142 Economic development 77 Study and teaching 63 Economic conditions 50 Law 45 Economic policy 44 Politics and government 43 Social conditions 38 Foreign speakers 37 History and criticism 37 Social aspects 37 Economics 36 Readers (Elementary) 35 Philosophy 30 Readers for new literates 29 Language and languages 27 Economic aspects 25 English literature 22 Poverty 21 Women 21 Research 19 Management 18 Pharmacy 18 Criticism and interpretation 15 Government policy 15 Human rights 15 Manpower policy 15 Mathematics 15 Methodology 15