Columbia subject headings:
China--Commerce--Foreign countries--China--History.
China--Commercial policy--History.
China--History--Ming dynasty, 1368-1644.
China--Politics and government--1368-1644.
Merchant marine--China--History.
Shipping--China--History.
Shipping--Government policy--China--History.
Harvard subject headings:
China--Commerce--Foreign countries--History.
China--Commercial policy--History.
China--History--Ming dynasty, 1368-1644.
Merchant marine--China--History
Shipping--China--History
Princeton subject headings:
China--Commerce--Foreign countries--History.
China--Commercial policy--History.
China--History--Ming dynasty, 1368-1644.
China--Politics and government--1368-1644.
Merchant marine--China--History.
Shipping--China--History.
Shipping--Government policy--China--History.