History 129 Land tenure 86 Architecture 60 Arquitectura 57 urban and land use planning 50 History and criticism 43 Planificación urbana y uso de las tierras 36 more ... Land reform 32 Politics and government 32 Tenencia de la tierra 32 Education 31 Historia 31 Land use 31 Law and legislation 31 Educación 27 Economic conditions 26 Social conditions 26 Social aspects 25 Philosophy 24 Criticism and interpretation 23 Management 17 Filosofía 16 Spanish literature 15 Indians of South America 14 Planificación urbana y de uso de las tierras 14 Study and teaching 14 City planning 13 Finance 13 General 13 Reforma agraria 13 less ...