Columbia subject headings:
Acqui Terme (Italy)--Church history--Congresses.
Catholic Church. Diocese of Acqui--History--Congresses.
Guido, d'Acqui, Saint, active 1034-1070--Congresses.
Harvard subject headings:
Acqui Terme (Italy)--Church history--Congresses.
Catholic Church. Diocese of Acqui--History--Congresses.
Guido, d'Acqui, Saint, active 1034-1070--Congresses.
Princeton subject headings: