History 122 Land tenure 86 Architecture 60 Arquitectura 58 urban and land use planning 50 History and criticism 43 Planificación urbana y uso de las tierras 36 more ... Land reform 32 Tenencia de la tierra 32 Historia 31 Land use 31 Law and legislation 31 Criticism and interpretation 25 Politics and government 24 Social conditions 22 Philosophy 20 Educación 17 Education 17 Economic conditions 16 Indians of South America 15 Filosofía 14 Indians of Mexico 14 Planificación urbana y de uso de las tierras 14 Social life and customs 14 Spanish literature 14 Reforma agraria 13 Science 13 Urbanization 12 Women 12 Literature 11 less ...