Columbia subject headings:
Harvard subject headings:
Cattedrale di Ferrara--Congresses.
Ferrara (Italy)--Church history--Congresses.
Ferrara (Italy)--History--Congresses.
Princeton subject headings:
Cattedrale di Ferrara--Congresses.
Ferrara (Italy)--Church history--Congresses.
Ferrara (Italy)--History--Congresses.