الموضوعات المستخلصة من بحثك.
الموضوعات المستخلصة من بحثك.
Irrigation
Drainage
25
Management
15
Congresses
14
Water-supply
14
Water resources development
12
Economic aspects
11
Agriculture
8
History
8
Irrigation farming
8
Research
8
Economic conditions
5
Irrigation engineering
5
Periodicals
5
Reclamation of land
5
Irrigation canals and flumes
4
Irrigation efficiency
4
Water conservation
4
Water-supply, Agricultural
4
Bibliography
3
Costs
3
Flood control
3
Forest management
3
Public works
3
Rice
3
Social conditions
3
Soils
3
Agriculture and state
2
Canals
2
Case studies
2
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2
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3
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6
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7وقائع المؤتمر كتابمنشور في 1969
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