Columbia subject headings:
Harvard subject headings:
Architecture, Renaissance--Italy--Ferrara--Congresses.
Castello Estense (Ferrara, Italy)--Congresses.
Este family--Homes and haunts--Italy--Ferrara--Congresses.
Ferrara (Italy)--Buildings, structures, etc.--Congresses.
Princeton subject headings:
Architecture, Renaissance--Italy--Ferrara--Congresses.
Castello Estense (Ferrara, Italy)--Congresses.
Este family--Homes and haunts--Italy--Ferrara--Congresses.
Ferrara (Italy)--Buildings, structures, etc.--Congresses.