Columbia subject headings:
Harvard subject headings:
Livorno (Italy)--Commerce--United States--History--18th century.
Livorno (Italy)--Relations--United States.
United States--Commerce--Italy--Livorno--History--18th century.
United States--Relations--Italy--Livorno.
Princeton subject headings:
Livorno (Italy)--Commerce--United States--History--19th century.
United States--Commerce--Livorno (Italy)--History--19th century.
United States--Foreign relations--Livorno (Italy).