Columbia subject headings:
International Drinking Water Supply and Sanitation Decade, 1981-1990--Congresses.
Rural health--Congresses.
Sanitation, Rural--Congresses.
Water resources development--Congresses.
Water--Pollution--Congresses.
Water-supply, Rural--Congresses.
Harvard subject headings:
International Drinking Water Supply and Sanitation Decade, 1981-1990--Congresses.
Rural health--Congresses.
Sanitation, Rural--Congresses.
Water resources development--Congresses
Water--Pollution--Congresses
Water-supply, Rural--Congresses.
Princeton subject headings:
International Drinking Water Supply and Sanitation Decade, 1981-1990--Congresses.
Water-supply, Rural--Congresses.