technique at Las Médulas, León,, Spain, one of the most important gold mines in the Roman Empire Vietnamese Las Médulas, tỉnh León, Tây Ban Nha. URL: https://commons
Christ of Miranda, Santa María de las Hoyas, Province of Soria, Castile and León, Spain. The hermitage constructed in the 18th century but its portal dates
and chronological description of the two stones found during the new paving of the Mexico's main plaza." (in English) by Antonio de Leon y Gama (1792).