History 142 Land tenure 86 Architecture 61 Arquitectura 58 urban and land use planning 50 Historia 39 History and criticism 37 more ... Planificación urbana y uso de las tierras 36 Politics and government 33 Land reform 32 Tenencia de la tierra 32 Land use 31 Law and legislation 31 Criticism and interpretation 29 Philosophy 27 Education 26 Social aspects 23 Law 21 Educación 20 Social conditions 19 Literature 18 American literature 17 Filosofía 17 Derecho 16 Indians of South America 16 Study and teaching 16 Literatura 14 Planificación urbana y de uso de las tierras 14 Economic conditions 13 Reforma agraria 13 less ...