SUBJECT
Water conservation
Soil conservation
24
Water-supply
19
Water supply
18
Water
14
El Niño
9
Water resources development
9
Water use
6
Management
5
Water quality
5
Agricultural engineering
4
Agroforestry
4
Angat Dam
4
Energy conservation
4
Hydraulic engineering
4
Study and teaching
4
Congresses
3
Environmental aspects
3
Government policy
3
Groundwater
3
Metro Manila
3
Metro Manila
3
Philippines. Department of Environment and Natural Resources
3
Pollution
3
Soil management
3
Technological innovations
3
Water consumption
3
Water quality management
3
Water shortages
3
Analysis
2
Aquifer storage recovery
2
Arid regions
2
Conferences
2
Economic aspects
2
Electronic books
2
Government agencies
2
Hotels
2
International cooperation
2
Juvenile literature
2
Philippines. Department of Environment and Natural Resources. National Water Resources Board
2
Rates
2
Soil science
2
Stream conservation
2
Water levels
2
Water-supply engineering
2
Water-supply, Agricultural
2
Watershed management
2
Acorda, Benjamin Jr
1
Africa
1
Agricultural education
1
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