geiriadur mawr =
Subtitle: The complete Welsh-English, English-Welshdictionary
By: [compiled by] H. Meurig Evans, W.O. Thomas; golygydd ymgynghorol = consulting editor, Stephen J. Williams.
Contributors: Thomas, W. O.; Williams, Stephen J. 1896-
Edition: Deunawfed argraffiad = 18th ed.
Publisher: Gwasg Gomer; C Davies
Published: 1993
Place of publication: Llandysul; Llandybïe
Language: mul