Y geiriadur mawr =
Subtitle: The complete Welsh-English English-Welsh dictionary
By: [by] H. Meurig Evans, W.O. Thomas; golygydd ymgynghorol (consulting editor) Stephen J. Williams.
Contributors: Thomas, W. O.; Williams, Stephen J. 1896-
Edition: 8th ed.
Publisher: Gwasg Gomer; Christopher Davies
Published: 1978
Place of publication: Llandysul
Language: eng