http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Puertos del Golfo de Mexico y Mar Caribe
Vols. for 1965- issued as Apendice 1, Parte A, of the Anales of the university's Instituto de Geofisica.
Universidad Nacional Autónoma de México.