Columbia subject headings:
Harvard subject headings:
China--Commerce--History--18th century.
China--History, Naval--1644-1912
China--History--Qing dynasty, 1644-1912--Historiography.
Navies--China--History--18th century.
Sea-power--China--History--18th century.
Princeton subject headings:
Navigation--China--History--18th century.
Navigation--China--History--19th century.