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1Llyfr
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2
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3gan Edmonds, Thomas P., Edmonds, Cindy D., McNair, Frances M., Olds, Philip R., Milam, Edward E.
Cyhoeddwyd 2008Llyfr -
4gan Edmonds, Thomas P., McNair, Frances M., Milam, Edward E., Olds, Philip R., Edmonds, Candy D.
Cyhoeddwyd 2003Llyfr