Historia 271 History 234 Filosofía 174 Social aspects 141 Research 135 Management 134 Study and teaching 116 Education 112 Crítica e interpretación 96 Psychology 83 Data processing 81 Philosophy 81 Politics and government 81 Economics 79 Economic conditions 71 History and criticism 65 Marketing 61 Social conditions 60 Histoire 56 Mathematics 56 Novela norteamericana 54 Taylor, Charles 54 Technological innovations 54 Aspectos sociales 51 Coleridge, Samuel Taylor 51 Economic history 51 Mathematical models 50 Economic aspects 48 Educación 48 Psychological aspects 47