Columbia subject headings:
United States--Politics and government--1961-1963.
United States--Politics and government--1963-1969.
Vietnam War, 1961-1975--Aerial operations, American.
Vietnam War, 1961-1975--United States.
Harvard subject headings:
United States--Politics and government--1961-1963.
United States--Politics and government--1963-1969.
Vietnam War, 1961-1975--Aerial operations, American
Vietnam War, 1961-1975--United States
Princeton subject headings:
United States--Politics and government--1961-1963.
United States--Politics and government--1963-1969.
Vietnam War, 1961-1975--Aerial operations, American.
Vietnam War, 1961-1975--United States.