Columbia subject headings:
Municipal water supply--Congresses.
Water conservation--Congresses.
Water resources development--Congresses.
Water reuse--Congresses.
Water use--Congresses.
Harvard subject headings:
Municipal water supply--Congresses.
Water conservation--Congresses
Water conservation--Metropolitan areas--Congresses.
Water resources development--Metropolitan area--Congresses.
Water resources development--Metropolitan areas--Congresses.
Water reuse--Congresses
Water reuse--Metropolitan areas--Congresses.
Water use--Congresses.
Water use--Metropolitan areas--Congresses.
Princeton subject headings:
Municipal water supply--Congresses.
Water conservation--Congresses.
Water resources development--Congresses.
Water reuse--Congresses.
Water use--Congresses.