Columbia subject headings:
Cardinals--Correspondence.
Catholic Church--Clergy--Correspondence.
Mercati, Giovanni, 1866-1957--Correspondence.
Harvard subject headings:
Cardinals--Italy--Correspondence.
Mercati, Giovanni, 1866-1957--Correspondence.
Princeton subject headings:
Cardinals--Correspondence.
Catalogs.
Catholic Church--Clergy--Correspondence.
Mercati, Giovanni, 1866-1957--Correspondence--Catalogs.
Mercati, Giovanni, 1866-1957--Correspondence.