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1Cyhoeddwyd 2004Awduron Eraill: “...Roget, Peter Mark, 1779-1869...”Based on: Thesaurus of English words and phrases / by Peter Mark Roget. Includes index.
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2Cyhoeddwyd 1982Awduron Eraill: “...Roget, Peter Mark, 1779-1869...”Based on Roget's Thesaurus of English words and phrases.
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3gan Mawson, C. O. Sylvester (Christopher Orlando Sylvester), 1870-1938Awduron Eraill: “...Roget, Peter Mark, 1779-1869...”
Cyhoeddwyd 1946
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