Columbia subject headings:
China--Foreign relations--1949-1976.
Soviet Union--Foreign relations--1953-1975.
United States--Politics and government--1945-1989.
Vietnam War, 1961-1975--United States.
Harvard subject headings:
China--Foreign relations--1949-1976.
Soviet Union--Foreign relations--1953-1975.
United States--Politics and government--1945-1989.
Vietnam War, 1961-1975--United States
Princeton subject headings:
China--Foreign relations--1949-1976.
Soviet Union--Foreign relations--1953-1975.
United States--Politics and government--1945-1989.
Vietnam War, 1961-1975--United States.