Columbia subject headings:
Harvard subject headings:
Castles--Italy--Emilia-Romagna--Congresses.
Emilia-Romagna (Italy)--Civilization--Congresses.
Legends--Italy--Emilia-Romagna--Congresses.
Princeton subject headings:
Emilia-Romagna (Italy)--Civilization--Congresses.
Legends--Italy--Emilia-Romagna--Congresses.