Columbia subject headings:
Harvard subject headings:
Bologna (Italy)--Archival resources--Italy--Bologna--Congresses.
Bologna (Italy)--Historiography--Congresses.
Bologna (Italy)--History--To 1506--Congresses.
Bologna (Italy)--History--To 1506--Sources.
Princeton subject headings:
Bologna (Italy)--Archival resources--Congresses.
Bologna (Italy)--Historiography--Congresses.
Bologna (Italy)--History--To 1506--Congresses.
Bologna (Italy)--History--To 1506--Sources.