Columbia subject headings:
China--Foreign relations--Soviet Union.
China--Foreign relations--Vietnam.
Soviet Union--Foreign relations--China.
Soviet Union--Foreign relations--Vietnam.
Vietnam--Foreign relations--China.
Vietnam--Foreign relations--Soviet Union.
Harvard subject headings:
China--Foreign relations--Vietnam.
Soviet Union--Foreign relations--Vietnam.
Vietnam--Foreign relations--China.
Vietnam--Foreign relations--Soviet Union.
Princeton subject headings:
China--Foreign relations--Soviet Union.
China--Foreign relations--Vietnam.
Soviet Union--Foreign relations--China.
Soviet Union--Foreign relations--Vietnam.
Vietnam--Foreign relations--China.
Vietnam--Foreign relations--Soviet Union.