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Dyfyniad Arddull ChicagoMedina, J.P. Costs Involved in the Domestic Production of Agri-based Import Substitutes: White Corn, Northern Mindanao. Quezon City: Special Studies Division, Planning Service, Ministry of Agriculture, 1980.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.