Columbia subject headings:
Harvard subject headings:
Livorno (Italy)--Relations--United States--Congresses.
Tuscany (Italy)--Relations--United States--Congresses.
United States--Relations--Italy--Livorno--Congresses.
United States--Relations--Italy--Tuscany--Congresses.
Princeton subject headings:
Livorno (Italy)--Relations--United States.
Tuscany (Italy)--Relations--United States.
United States--Relations--Italy--Livorno.