Columbia subject headings:
Architecture--Italy--Guastalla.
City planning--Italy--Guastalla--History.
Guastalla (Italy)--History.
Harvard subject headings:
Architecture--Italy--Guastalla.
City planning--Italy--Guastalla--History.
Guastalla (Italy)--History.
Princeton subject headings:
City planning--Italy--Guastalla.
Guastalla (Italy)--History.