Columbia subject headings:
Nobility--Italy--Tuscany--History--Congresses.
Social structure--Italy--Tuscany--History--Congresses.
Tuscany (Italy)--History--Congresses.
Upper class--Italy--Tuscany--History--Congresses.
Harvard subject headings:
Nobility--Italy--Tuscany--History--Congresses.
Social structure--Italy--Tuscany--History--Congresses.
Tuscany (Italy)--History--Congresses.
Upper class--Italy--Tuscany--History--Congresses.
Princeton subject headings:
Nobility--Italy--Tuscany--History--Congresses.
Social structure--Italy--Tuscany--History--Congresses.
Tuscany (Italy)--History--Congresses.
Upper class--Italy--Tuscany--History--Congresses.