Columbia subject headings:
Gardens--Design--Congresses.
Landscape architecture--Congresses.
Urban gardens--Congresses.
Harvard subject headings:
Gardens--Designs and plans--Congresses.
Gardens--Europe--Designs and plans--Congresses.
Gardens--Social aspects--Europe--Congresses.
Landscape architecture--Congresses
Landscape architecture--Europe--Congresses.
Urban gardens--Congresses.
Urban gardens--Europe--Case studies.
Urban gardens--Europe--Congresses.
Princeton subject headings: