Columbia subject headings:
China--Foreign relations--1644-1912.
China--History--Qing dynasty, 1644-1912--Sources.
Harvard subject headings:
China--Foreign relations--1644-1912
China--History--Qing dynasty, 1644-1912--Sources.
Princeton subject headings:
China--Foreign relations--Spain--Sources.
China--History--Qing dynasty, 1644-1912--Sources.
Spain--Foreign relations--China--Sources.