Columbia subject headings:
Harvard subject headings:
China--History--Qing dynasty, 1644-1912--Sources.
Junks--East Asia--Sources.
Korea--History--Chosŏn dynasty, 1392-1910--Sources.
Shipping--East Asia--Sources.
Shipping--Pacific Area--Sources.
Princeton subject headings:
China--History--Qing dynasty, 1644-1912.
Merchant marine--China--History.
Shipping--China--History.