History 146 Land tenure 86 Motion picture plays, Spanish 67 Architecture 57 Arquitectura 56 History and criticism 54 urban and land use planning 50 more ... General 40 Historia 40 Planificación urbana y uso de las tierras 36 Land reform 32 Philosophy 32 Politics and government 32 Tenencia de la tierra 32 Land use 31 Social conditions 30 Educación 29 Filosofía 28 Criticism and interpretation 27 Law and legislation 27 Motion picture plays 25 Education 24 Man-woman relationships 23 Economic conditions 22 Ciencias sociales 21 Medicina 20 Women 18 Indians of South America 16 Research 16 Science 16 less ...