Columbia subject headings:
Harvard subject headings:
Archives--Italy--Milan--Congresses.
Catholic Church. Archdiocese of Milan (Italy)--Archives.
Milan (Italy)--History--Sources--Congresses.
Princeton subject headings:
Archives--Italy--Milan--Congresses.
Catholic Church. Archdiocese of Milan (Italy)--Archives.
Milan (Italy)--History--Sources--Congresses.