Columbia subject headings:
Harvard subject headings:
China--Commerce--East Asia--History--Congresses.
East Asia--Commerce--China--History--Congresses.
Merchant marine--China--History--Congresses.
Navigation--China--History--Congresses.
Silk Road--History--Congresses.
Princeton subject headings:
China--Commerce--East Asia--History.
East Asia--Commerce--History.
Merchant marine--China--History.
Navigation--China--History.
Silk Road--History.