Columbia subject headings:
China--Foreign relations--Netherlands.
China--Foreign relations--Portugal.
China--Foreign relations.
Netherlands--Foreign relations--China.
Portugal--Foreign relations--China.
Harvard subject headings:
China--Foreign relations--Netherlands.
China--Foreign relations--Portugal.
China--Foreign relations--To 1912.
Netherlands--Foreign relations--China.
Portugal--Foreign relations--China.
Princeton subject headings:
China--Foreign relations--Netherlands.
China--Foreign relations--Portugal.
China--Foreign relations--To 1912.
Netherlands--Foreign relations--China.
Portugal--Foreign relations--China.