Columbia subject headings:
Vietnam (Democratic Republic)--Foreign relations.
Vietnam (Democratic Republic)--History.
Vietnam War, 1961-1975--Causes.
Harvard subject headings:
Vietnam (Democratic Republic)--Foreign relations.
Vietnam (Democratic Republic)--History.
Vietnam War, 1961-1975--Causes.
Princeton subject headings:
Vietnam (Democratic Republic)--Foreign relations.
Vietnam (Democratic Republic)--History.
Vietnam War, 1961-1975--Causes.