geiriadur mawr =
Subtitle: the complete Welsh-English, English-Welsh dictionary
By: H. Meurig Evans, W.O. Thomas ; golygydd ymgynghorol (consulting editor) Yr Athro Stephen J.Williams.
Contributors: Thomas, W. O.
Publisher: Gwasg Aberystwyth
Published: 1958
Place of publication: Aberystwyth
Language: wel
Number of pages: 470