Columbia subject headings:
Pisa (Italy)--Civilization--Congresses.
Pisa (Italy)--History--Congresses.
Pisa (Italy)--Intellectual life--Congresses.
Harvard subject headings:
Pisa (Italy)--Civilization--Congresses.
Pisa (Italy)--History--Congresses.
Pisa (Italy)--Intellectual life--Congresses.
Princeton subject headings:
Pisa (Italy)--Civilization--Congresses.
Pisa (Italy)--History--Congresses.
Pisa (Italy)--Intellectual life--Congresses.