History 143 Philosophy 117 Marxism 110 Economics 98 Communism 89 Literature 79 Social Sciences 75 Marxian economics 71 Political Science 58 Sociology 55 Biography 54 Socialism 52 Karl Marx 51 American fiction 50 History and criticism 49 Mathematics 49 Social sciences 39 English literature 37 Novel 37 Education 36 Capitalism 35 Journal, Verbal Learning and Verbal Behaviour 35 Research 34 Management 33 Marxian systems--Socialism--Economics 32 Spanish fiction 32 Religion 31 International relations 30 Literature English 30 Criticism 28