Columbia subject headings:
Harvard subject headings:
United States--History--1945-
Vietnam War, 1961-1975
Vietnam War, 1961-1975--United States
Vietnam--History
Vietnam--History--1858-1945
Vietnam--History--1945-1975
Princeton subject headings:
United States--History--1945-
Vietnam War, 1961-1975--United States.
Vietnam--History--.