Columbia subject headings:
Tet Offensive, 1968.
United States--Politics and government--1963-1969.
United States. Central Intelligence Agency--History.
Vietnam War, 1961-1975--Military intelligence.
Vietnam War, 1961-1975--United States.
Harvard subject headings:
Princeton subject headings:
United States--Foreign relations--Vietnam.
United States. Central Intelligence Agency
Vietnam War, 1961-1975--Diplomatic history.
Vietnam War, 1961-1975--Secret service--United States.
Vietnam--Foreign relations--United States.
Vietnam--Politics and government--1945-1975.