Columbia subject headings:
Harvard subject headings:
Intercoastal shipping--Africa, East--History--To 1500.
Intercoastal shipping--Asia--History--To 1500.
Intercoastal shipping--Europe--History--To 1500.
Merchant marine--Africa, East--History--To 1500.
Merchant marine--Asia--History--To 1500.
Merchant marine--Europe--History--To 1500.
Shipping--Africa, East--History--To 1500.
Shipping--Japan--History--To 1500.
Silk Road--History--To 1500.
Princeton subject headings:
Asia--Commerce--Europe--History.
Europe--Commerce--Asia--History.
Europe--History--1492-1648.
Ocean travel--History.
Trade routes--Asia--History.