Columbia subject headings:
Art, Italian--Exhibitions.
Castello Estense (Ferrara, Italy)--Art--Exhibitions.
Harvard subject headings:
Art, Italian--Exhibitions
Castello Estense (Ferrara, Italy) in art--Exhibitions.
Castello Estense (Ferrara, Italy)--Exhibitions.
Ferrara (Italy)--Buildings, structures, etc.--Exhibitions.
Princeton subject headings:
Castello estense (Ferrara, Italy)
Castles--Italy--Ferrara.
Este family.