History 198 Land tenure 86 Architecture 61 Historia 60 History and criticism 60 Arquitectura 59 urban and land use planning 50 more ... Educación 46 Philosophy 46 Education 45 General 45 Politics and government 40 Filosofía 36 Planificación urbana y uso de las tierras 36 Law and legislation 35 Land reform 32 Tenencia de la tierra 32 Land use 31 Social conditions 31 Social aspects 27 Study and teaching 26 Medicina 25 Economic conditions 24 Criticism and interpretation 23 Science 23 Ciencias sociales 22 Management 21 Indians of South America 20 Law 20 Spanish literature 19 less ...