Columbia subject headings:
United States--Foreign relations--Vietnam--Sources.
Vietnam War, 1961-1975--Sources.
Vietnam--Foreign relations--United States--Sources.
Vietnam--History--1945-1975--Sources.
Harvard subject headings:
United States--Foreign relations--Vietnam--Sources.
Vietnam War, 1961-1975--Sources
Vietnam--Foreign relations--United States--Sources.
Vietnam--History--1945-1975--Sources.
Princeton subject headings:
United States--Foreign relations--Vietnam--Sources.
Vietnam War, 1961-1975--Sources.
Vietnam--Foreign relations--United States--Sources.
Vietnam--History--1945-1975--Sources.