Columbia subject headings:
Harvard subject headings:
City planning--Europe--Congresses
Hydraulic engineering--Europe--Congresses.
Regional planning--Europe--Congresses.
Water and architecture--Europe--Congresses.
Water in landscape architecture--Europe--Congresses.
Princeton subject headings:
City planning--Europe--Congresses.
Hydraulic engineering--Europe--Congresses.
Regional planning--Europe--Congresses.
Water and architecture--Europe--Congresses.
Water in landscape architecture--Europe--Congresses.