The Tripitaka Koreana, which was crafted in two versions (the first one was destroyed by fire during the Mongol invasions of Korea), is a Korean collection of the Tripitaka carved onto 81,258 wooden printing blocks during the 13th century. Still intact in good condition after some 750 years, it has been described by the UNESCO committee as "one of the most important and most complete corpus of Buddhist doctrinal texts in the world".