Thanh Tra Huyen Bac Son Address: TK Hoang Van Thu, Bac Son Town, Bac Son District, Lang Son Province Enterprise code: 4900358412 Phone: 02053837194 Adress: Bac Son District, Lang Son Province Bac Son Town, Bac Son District, Lang Son ProvinceFounding date: 31 - 7 - 2009