History 110 Land tenure 86 Architecture 63 Arquitectura 59 urban and land use planning 50 History and criticism 37 Planificación urbana y uso de las tierras 36 more ... Politics and government 34 Land reform 32 Tenencia de la tierra 32 Land use 31 Social conditions 25 Philosophy 24 Law and legislation 23 Historia 21 Social aspects 20 Indians of South America 19 Social life and customs 17 Criticism and interpretation 16 Education 14 Planificación urbana y de uso de las tierras 14 Economic conditions 13 Reforma agraria 13 Urbanization 13 Law 12 Rural conditions 12 Agriculture 10 Mexican Americans 10 Spanish literature 10 General 9 less ...