Columbia subject headings:
China--Commerce--History.
Commerce--History--Medieval, 500-1500.
Islamic Empire--Commerce--Early works to 1800.
Islamic Empire--Description and travel--Early works to 1800.
Harvard subject headings:
Princeton subject headings:
Commerce--History--Medieval, 500-1500.
Islamic Empire--Commerce--Early works to 1800.
Islamic Empire--Description and travel--Early works to 1800.