History 324 History and criticism 125 Politics and government 105 Philosophy 85 Criticism and interpretation 77 General 61 Historia 61 more ... Población 61 Population 60 Social conditions 55 Education 54 Educación 52 Agricultura 43 Spanish literature 42 Publicaciones periódicas 40 Tecnología 40 Social aspects 39 Technology 37 Agriculture 36 Spanish language 36 Economic conditions 35 Science 35 Civilization 33 Study and teaching 33 Literature 31 Periodicals 30 Agronomía 28 Agronomy 27 Literatura 27 Political science 26 less ...