Columbia subject headings:
Cremona (Italy)--Buildings, structures, etc.--Exhibitions.
Towers--Italy--Cremona--Exhibitions.
Harvard subject headings:
Cremona (Italy)--Buildings, structures, etc.
Towers--Italy--Cremona--Pictorial works.
Princeton subject headings:
Cremona (Italy)--Buildings, structures, etc.
Towers--Italy--Cremona--Pictorial works.