Columbia subject headings:
Business enterprises--Sweden--Visby--History--18th century.
Visby (Sweden)--Commerce--History--18th century.
Harvard subject headings:
Business enterprises--Sweden--Visby--History--18th century.
Visby (Sweden)--Commerce--History--18th century.
Princeton subject headings:
Gotland (Sweden)--Commerce--History.
Handelshaus Donner (Firm)--History.
Merchant marine--Sweden--Visby--History--18th century.
Navigation--Baltic Sea--History--18th century.
Shipping--Sweden--Visby--History--18th century.
Visby (Sweden)--Commerce--History.