SUBJECT
Management
3
Roads
3
Costs
2
Design and construction
2
Hand pumps
2
Maintenance and repair
2
Nutrition policy
2
Research
2
Sanitation
2
Water supply
2
Citizen participation
1
Climatic changes
1
Congresses
1
Cost of operation
1
Deterioration
1
Economic development
1
Environmental aspects
1
Environmental conditions
1
Environmental management
1
Environmental policy
1
Finance
1
Greenhouse gases
1
Hazardous wastes
1
Highway capacity
1
International Drinking Water Supply and Sanitation Decade, 1981-1990
1
International cooperation
1
Irrigation
1
Malnutrition
1
Mathematical models
1
Motor vehicles
1
Outhouses
1
Pavements
1
Prevention
1
Underdeveloped areas
1
Waste disposal in the ground
1
Water quality
1
Water-supply
1
Water-supply engineering
1
Water-supply, Rural
1
World health
1