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2Cyhoeddwyd 1997
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5Protection of human subjects : Title 45, Code of federal regulations, part 46, revised June 18, 1991Cyhoeddwyd 1992
Dogfen y Llywodraeth Llyfr -
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7Cyhoeddwyd 1983
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8gan Collinson, George Dale
Cyhoeddwyd 1812
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9Cyhoeddwyd 1876
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14Cyhoeddwyd 1937
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