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2
-
Design-management interactions of Malaysia's Kerian irrigation scheme / Alfredo Valera and Mohd. Nor Bin Hj. Mohd. Desa.
- International irrigation management institute,
- cop. 1991.
- Colombo :
-
Irrigation management for diversified cropping in rice-based systems in the Philippines / Alfredo Valera.
- International irrigation management institute,
- 1992.
- Colombo :