Columbia subject headings:
Cao Bang, Battle of, Vietnam, 1950.
Dong Khe, Battle of, Đông Khê, Vietnam, 1950.
Harvard subject headings:
Cao Bang, Battle of, Vietnam, 1950.
Dong Khe, Battle of, Đông Khê, Vietnam, 1950.
Đông Khê (Vietnam)--History.
Princeton subject headings:
Indochinese War, 1946-1954--Campaigns--Vietnam--Dông Khê--History.