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