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*** Rydym yn ymwybodol nad yw rhai o adnoddau Oxford Reference yn gweithio'n allanol, mae hyn oherwydd problemau technegol. Rydym yn ceisio cywiro'r broblem, ac rydym yn anelu at ddychwelyd y gwasanaeth cyn gynted ag y bo modd.
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19th
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Credo Reference
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