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1Cyhoeddwyd 1985“...Documentary Educational Resources,...”
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2Cyhoeddwyd 2005“...Documentary Educational Resources,...”
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3Cyhoeddwyd 2007“...Documentary Educational Resources,...”
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4Cyhoeddwyd 2008“...Documentary Educational Resources,...”
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5Cyhoeddwyd 2005“...Documentary Educational Resources,...”
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6Cyhoeddwyd 2000“...Documentary Educational Resources,...”
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7Cyhoeddwyd 2001“...Documentary Educational Resources,...”
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8Cyhoeddwyd 1986“...Documentary Educational Resources (DER),...”
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