Columbia subject headings:
Bologna (Italy)--Religious life and customs--Congresses.
Christian hagiography--Congresses.
Proculus, Saint, -approximately 304--Art--Congresses.
Proculus, Saint, -approximately 304--Cult--Italy--Bologna--Congresses.
Harvard subject headings:
Bologna (Italy)--Religious life and customs--Congresses.
Christian hagiography--Congresses.
Proculus, Saint, -approximately 304--Art--Congresses.
Proculus, Saint, -approximately 304--Cult--Italy--Italy--Bologna--Congresses.
Princeton subject headings:
Christian hagiography--Congresses.
Proculus, Saint, -approximately 304--Cult--Italy--Bologna--Congresses.