Columbia subject headings:
Bell towers--Italy--Tuscany.
Bells--Italy--Tuscany.
Church bells--Italy--Tuscany.
Harvard subject headings:
Bell towers--Italy--Tuscany--Pictorial works.
Bells--Italy--Tuscany--Pictorial works.
Princeton subject headings:
Bell towers--Italy--Tuscany--Pictorial works.
Bells--Italy--Tuscany--Pictorial works.