Columbia subject headings:
Coasts--Italy--Maremma--Congresses.
Landscape architecture--Italy--Maremma--Congresses.
Harvard subject headings:
Coasts--Italy--Maremma--Congresses.
Landscape architecture--Italy--Maremma--Congresses.
Princeton subject headings:
Coasts--Italy--Maremma--Congresses.
Landscape architecture--Italy--Maremma--Congresses.