Columbia subject headings:
Harvard subject headings:
Canon law--History--19th century.
Canon law--Study and teaching--Italy--History--19th century--Congresses.
Canon law--Study and teaching--Italy--History--20th century--Congresses.
Ecclesiastical law--Italy--History--19th century.
Ecclesiastical law--Study and teaching--Italy--History--19th century--Congresses.
Ecclesiastical law--Study and teaching--Italy--History--20th century--Congresses.
Princeton subject headings:
Canon law--History--19th century.
Ecclesiastical law--Italy--History--19th century.