Columbia subject headings:
Bologna (Italy)--Church history--Sources.
Catholic Church--Italy--Bologna.
San Salvatore di Bologna (Church)
Harvard subject headings:
Bologna (Italy)--Church history--Sources.
Catholic Church--Germany--Bologna.
San Salvatore di Bologna (Church)
Princeton subject headings:
Bologna (Italy)--Church history--Sources.
Catholic Church--Italy--Bologna.
SS. Salvatore (Church : Bologna, Italy)