Columbia subject headings:
Gardening--Europe--Congresses.
Lakeside architecture--Europe--Congresses.
Landscape architecture--Europe--Congresses.
Harvard subject headings:
Water gardens--Europe--Congresses.
Water gardens--Italy--Congresses.
Water in landscape architecture--Europe--Congresses.
Water in landscape architecture--Italy--Congresses.
Wetland landscape design--Europe--Congresses.
Wetland landscape design--Italy--Congresses.
Princeton subject headings:
Water gardens--Europe--Congresses.
Water gardens--Italy--Congresses.
Water in landscape architecture--Europe--Congresses.
Water in landscape architecture--Italy--Congresses.
Wetland landscape design--Europe--Congresses.
Wetland landscape design--Italy--Congresses.