Columbia subject headings:
United States--Foreign relations--1945-1989.
United States--Foreign relations--Vietnam.
Vietnam War, 1961-1975--Origin.
Vietnam--Foreign relations--United States.
Vietnam--History--20th century.
Harvard subject headings:
France--Foreign relations--Vietnam.
United States--Foreign relations--1945-
United States--Foreign relations--Vietnam.
Vietnam War, 1961-1975--Causes.
Vietnam--Foreign relations--France.
Vietnam--Foreign relations--United States.
Vietnam--History--20th century.
Princeton subject headings:
United States--Foreign relations--1945-1989.
United States--Foreign relations--Vietnam.
Vietnam War, 1961-1975--Origins.
Vietnam--Foreign relations--United States.
Vietnam--History--20th century.