Columbia subject headings:
Arno River (Italy)--Pictorial works.
Arno River Valley (Italy)
Parks--Italy--Arno River Valley--Planning.
Parks--Italy--Tuscany--Planning.
Harvard subject headings:
Arno River Valley (Italy)--Environmental aspects.
Regional planning--Italy--Arno River Valley.
Waterfronts--Italy--Arno River Valley.
Wetland landscape design--Italy.
Princeton subject headings: