Y geiriadur mawr =
Subtitle: The complete Welsh-English, English-Welsh dictionary
By: [compiledby] H. Meurig Evans, W.O. Thomas golygydd ymgynghorol = consulting editor, Stephen J. Williams.
Contributors: Thomas, W. O.; Williams, Stephen J. 1896-
Edition: Ugeinfed argraffiad = 20th ed.
Publisher: Gwasg Gomer; Christopher Davies
Published: 1995
Place of publication: Llandysul; Llandybïe
Language: wel
Number of pages: 492