Thesaurus of english words and phrases classified and arranged so as to facilitate the expression of ideas and assist in literary composition

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• The Oxford thesaurus : an A-Z dictionary of synonyms
  gan: Urdang, Laurence.
  Cyhoeddwyd: 1991
• Historical thesaurus of the Oxford English dictionary : with additional material from A thesaurus of old English
  Cyhoeddwyd: 2008
• The Oxford paperback thesaurus
  Cyhoeddwyd: 1994
• The Cambridge French-English thesaurus
  gan: Lamy, Marie-Noëlle, 1949-
  Cyhoeddwyd: 1998
• The Cambridge thesaurus of American English
  gan: Lutz, William D, 1940-
  Cyhoeddwyd: 1994