Columbia subject headings:
Harvard subject headings:
Benedictines--Italy--History--Congresses.
Monasteries--Italy--Bobbio--Congresses.
Princeton subject headings:
Benedictines--Italy--Bobbio--Congresses.
Benedictines--Italy--Piacenza (Province)--Congresses.
Bobbio (Italy)--Church history--Congresses.
Piacenza (Italy : Province)--Church history--Congresses.