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Dyfyniad Arddull ChicagoAsian Development Bank, International Irrigation Management Institute, and Regional Seminar on Irrigation Service Fees. Irrigation Service Fees. Manila, Philippines: The Bank, 1986.
Dyfyniad MLAAsian Development Bank, et al. Irrigation Service Fees. The Bank, 1986.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.