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^J. Wills Burke - Origines: the streets of Vietnam : a historical companion 2001 - Page 53 "Movement, this rebellion was most active in Yên Thế District, Bắc Giang Province. Under Để Thám's leadership, the Yên Thế Insurrection lasted for some 25 years (1887–1913). In an effort to suppress the insurrection, the French established a ...
^Đức Thọ Ngô, Vạn Nguyên Nguyễn, Philippe Papin Đồng Khánh địa dư chí - Volume 2 2003- Page 1486 "Yams are produced by the inhabitants of the commune of Đình Bảng, district of Ðóng Ngạn. The hardy variety of southern ginseng grows on the mountain of Chung Sơn, district of Yên Thế, and angelica grows on the mountain of Tieu Sơn, ..