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Dyfyniad Arddull ChicagoIRRI. Farm-level Constraints to High Rice Yields in Asia: 1974 - 1977. Manila: IRRI, 1978.
Dyfyniad MLAIRRI. Farm-level Constraints to High Rice Yields in Asia: 1974 - 1977. Manila: IRRI, 1978.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.