Columbia subject headings:
Harvard subject headings:
Catholic Church--Italy--History--Congresses.
Catholic Church--Poland--History--Congresses.
Italy--Social conditions--Congresses.
Poland--Social conditions--Congresses.
Social history--Congresses
Social history--Medieval, 500-1500--Congresses
Princeton subject headings:
Italy--History--Congresses.
Italy--Intellectual life--History--Congresses.
Poland--History--Congresses.
Poland--Intellectual life--History--Congresses.