History 130 Land tenure 86 Architecture 59 Arquitectura 57 Educación 52 Education 52 urban and land use planning 50 more ... General 46 History and criticism 40 Historia 39 Planificación urbana y uso de las tierras 36 Law and legislation 34 Land reform 32 Philosophy 32 Tenencia de la tierra 32 Land use 31 Politics and government 28 Social conditions 27 Filosofía 26 Medicina 20 Ciencias sociales 19 Economic conditions 19 Research 19 American literature 18 Publicaciones periódicas 18 Curricula 17 Management 17 Periodicals 17 Urbanization 17 Criticism and interpretation 16 less ...