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