Columbia subject headings:
United States--History--1961-1969.
United States--History--1969-
Vietnam War, 1961-1975--United States.
Harvard subject headings:
United States--History--1961-1969.
United States--History--1969-
Vietnam War, 1961-1975--United States
Princeton subject headings:
United States--History--1961-1975.
United States--History--1969-
Vietnam War, 1961-1975--United States.