Land tenure 86 History 70 Architecture 58 Arquitectura 56 urban and land use planning 50 Planificación urbana y uso de las tierras 36 Land reform 32 more ... Tenencia de la tierra 32 Land use 31 Law and legislation 23 Politics and government 18 Historia 15 Social conditions 15 Planificación urbana y de uso de las tierras 14 Reforma agraria 13 Indians of South America 12 Urbanization 12 Economic conditions 11 Mexican Americans 10 Government relations 9 History and criticism 9 Land use, Urban 9 Rural conditions 9 Agriculture 8 City planning 8 Land settlement 8 Land use, Rural 7 Urbanización 7 American literature 6 Civil rights 6 less ...