Columbia subject headings:
Harvard subject headings:
China--Commercial treaties.
China--Foreign relations--To 1644.
Pu, Shougeng, 1245-1284
Princeton subject headings:
Arabian Peninsula--Commerce--China.
China--Commerce--Arabian Peninsula.
China--Commercial treaties.
China--Foreign relations--To 1644.
Pu, Shougeng, 1245-1284.
Shipping--China.