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1Llyfrgan Rao, M. V. S.“...United Nations University. Human and Social Development Programme...”
Cyhoeddwyd 1978
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2LlyfrCyhoeddwyd 1979“...United Nations University. Human and Social Development Programme...”
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3LlyfrCyhoeddwyd 1978“...United Nations University. Human and Social Development Programme...”
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4Trafodyn Cynhadledd LlyfrCyhoeddwyd 1979“...United Nations University. Human and Social Development Programme...”