Columbia subject headings:
Catholic Church--Italy--Bologna--History--Middle Ages, 600-1500.
Church buildings--Italy--Bologna (Province)--History.
Harvard subject headings:
Bologna (Italy : Province)--Church history.
Catholic Church--Italy--Bologna--History.
Catholic Church. Archdiocese of Bologna (Italy)--History.
Catholic church buildings--Italy--Bologna (Province)
Christian art and symbolism--Italy--Bologna (Province)--Medieval, 500-1500.
Church buildings--Italy--Bologna (Province)--History.
Princeton subject headings:
Catholic Church--Italy--Bologna--History--Middle Ages, 600-1500.
Church buildings--Italy--Bologna (Province)--History.