Columbia subject headings:
Commerce--History--Medieval, 500-1500.
Gotland (Sweden)--Commerce--History.
Hanseatic League--History.
Harvard subject headings:
Commerce--History--Medieval, 500-1500
Gotland (Sweden)--Commerce--History.
Hanseatic League--History.
Princeton subject headings:
Commerce--History--Medieval, 500-1500.
Gotland (Sweden)--Commerce--History.
Hanseatic League--History.