Columbia subject headings:
Middle Ages--Congresses.
Vicopisano (Italy)--History--Sources--Congresses.
Vicopisano (Italy)--Politics and government--Congresses.
Harvard subject headings:
Middle Ages--Congresses
Vicopisano (Italy)--History--Sources--Congresses.
Vicopisano (Italy)--Politics and government--History--Congresses.
Princeton subject headings:
Vicopisano (Italy)--History.