found: Work cat.: The Lang Vac sites, 2004:p. 6 ("... many burials were made during the Dong Son culture")
found: The Facts on File dict. of archaeology, c1983(Dong-son. The classic Bronze Age of North Vietnam, dated c500 bc to ad 100 ... characteristic are large incised bronze drums)
found: Britannica concise encycl. (online), Feb. 20, 2007(Dong Son culture)
found: Historical dict. of Vietnam, 3rd ed., 2006(Dông-son culture; named for village in North Vietnam)̂̂
found: Wikipedia, Apr. 18, 2007(Dong Son culture)
found: Wikipedia, Sept. 18, 2012(Văn hóa Đông Sơn; Đông Sơn culture (literally "East Mountain") was a prehistoric Bronze Age age in Vietnam centered at the Red River Valley of northern Vietnam.)
