http://www.e-local.gob.mx/work/templates/enciclo/guanajuato/hist.htm http://www.historicas.unam.mx/moderna/ehmc/ehmc14/187.html https://web.archive.org/web/20101223114649/http://www.bicentenario.gob.mx/bdb/bdbpdf/NBNM/R/23.pdf Historical regions in Mexico Geography of Mexico Geography of Mesoamerica Pre-Columbian cultural areas Regions of Mexico