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Dyfyniad Arddull ChicagoThe Future of Natural and Synthetic Rubbers. London: The International Rubber Study Group, 1962.
Dyfyniad MLAThe Future of Natural and Synthetic Rubbers. The International Rubber Study Group, 1962.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.