Y Geiriadur Mawr =
Subtitle: The complete Welsh-English, English-Welsh Dictionary
By: H. Meurig Evans,W. O. Thomas ; Consulting editor Stephen J.Williams.
Contributors: Thomas, W. O.
Edition: 4th ed rev.
Publisher: Llyfrau'r dryw; Gwasg Aberystwyth
Published: 1968
Place of publication: Llandybie; Aberystwyth
Language: wel
Number of pages: 367