Columbia subject headings:
Water conservation--Case studies.
Harvard subject headings:
Arid regions--Research--Congresses.
Arid regions--Research--Exhibitions.
Water conservation projects--Exhibitions.
Water conservation--Case studies.
Water conservation--Congresses
Princeton subject headings:
Arid regions--Research--Congresses.
Arid regions--Research--Exhibitions.
Case studies.
Water conservation projects--Exhibitions.
Water conservation--Case studies.
Water conservation--Congresses.