Dissertations, Academic (Ph.D) 954 Education 360 Schools of economic thought-- Economics 197 Thesis (Ph.D)-Chemistry 179 Thesis (Ph.D)-Education 130 Thesis (Ph.D)-Physics 111 History 99 Teaching 91 Administration 90 Dissertations, Academic(Ph.D) 79 Philosophy 74 General management 73 Education, Secondary 72 Management 68 School management and organization 63 Schools 62 Dissertations, Academic (Ph.D.) 60 Criticism and interpretation 58 Leadership 54 Thesis (Ph.D)-English literature 54 Kerala 51 India 50 Learning 50 United States 50 Economics 49 Mathematics 47 Education-Secondary 46 Educational leadership 43 Social Sciences 43 Great Britain 42