Columbia subject headings:
Europe--Relations--Italy--Tuscany--Congresses.
Science--Europe--History--Congresses.
Science--Italy--Tuscany--History--Congresses.
Tuscany (Italy)--Relations--Europe--Congresses.
Harvard subject headings:
Europe--Relations--Italy--Tuscany--Congresses.
Science--Europe--History--Congresses.
Science--Italy--Tuscany--History--Congresses.
Tuscany (Italy)--Relations--Europe--Congresses.
Princeton subject headings:
Europe--Relations--Italy--Tuscany--Congresses.
Science--Europe--History--Congresses.
Science--Italy--Tuscany--History--Congresses.
Tuscany (Italy)--Relations--Europe--Congresses.