http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
division municipal al 8 de junio de 1960
Secretaría de Industria y Comercio, Dirección General de Estadística, Departmento Tecnico, Oficina de Representaciones Gráficas y Cartografia.
Includes graph showing population growth since 1900, list of towns and states with population and 3 ancillary maps of more populated regions.