At Hoa An district, archaeologists discovered ruins Megalith 2 (May 2001) and especially this megalithic monuments related to historical lore of the Tay people: "Princess Nine paintings King "related to historical figures Thuc Phan An Duong Vuong and water on the land of Cao Bang Nangang old [Quick Match Program, 2002. From folklore to Megalithic ruins (Dolmel) in Cao Bang. Announcement folklore 2001. Vietnam National University Publishing House Nooiij, Tr163-167].
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