History 724 History and criticism 200 Politics and government 166 Education 109 Criticism and interpretation 104 Educación 102 Philosophy 99 more ... General 98 Social conditions 94 Social aspects 86 Historia 77 Spanish literature 67 Economic conditions 66 Agriculture 59 Spanish language 59 Agricultura 54 Antiquities 54 Civilization 53 Indians of South America 53 Study and teaching 51 Publicaciones periódicas 50 Tecnología 50 Technology 47 Research 46 Social life and customs 45 Education, Higher 44 Women 44 Literature 42 Periodicals 41 Foreign relations 40 less ...