Papurau W. J. Gruffydd,[1903]-[1952], yn cynnwys drafftiau o erthyglau'n ymwneud â'r Mabinogi; nodiadau darlith ar gyfer ei gyrsiau Cymraeg yng Ngholeg Prifysgol Cymru, Caerdydd; nodiadau darlithoedd ac erthyglau eraill; sgyrsiau a darlledwyd gan y BBC; personalia; a grŵp sylweddol o ohebiaeth oddi wrth ffigurau llenyddol blaenllaw = Papers of W. J. Gruffydd, [1903]-[1952], including drafts of articles relating to the Mabinogi; lecture notes for his Welsh courses at University College of Wales, Cardiff; other lecture notes and articles; BBC broadcast talks; personalia; and a substantial group of correspondence from notable literary figures.

Llawysgrif traethawd MA Griffith John Williams, 'The verbal forms in the Mabinogion and Bruts'.

The literary and academic papers, 1921-1992, of Prof. Gwyn Jones, comprising correspondence, 1936-1991; manuscripts and typescript drafts of his literary works, 1939-1992, including poetry and prose; translations of the Mabinogion and Icelandic sagas, 1921-1991; the history of Scandinavia, 1961-1988; his work as editor of various publications such as The Welsh Review, Welsh Short Stories and the Oxford Book of Welsh Verse in English, 1935-1977; papers relating to the establishment of a national theatre for Wales, 1962-1977; articles, lectures and broadcasts on various topics, 1942-1992; together with some personal papers and publications of other authors.