The collection consists of the following papers :
Copies in the hand of Thomas Roberts of the works of such poets as Lewis Glyn Cothi, Guto'r Glyn, Lewis Mon, Tudur Aled, Dafydd Nanmor, Tudur Penllyn and numerous other belonging to the 15th century.
Drafts etc. of some of the published works of Thomas Roberts. The subjects covered include Gutun Owain, Tudur Penllyn, Ieuan ap Tudur Penllyn, Guto'r Glyn, Dafydd ab Edmwnd.
Notes on the authorship of poems, pedigrees, historical references etc.
Lectures on such subjects as the Welsh language, Welsh literature, Welsh and English in primary schools etc.
Plays being translations by Thomas Roberts.
A collection of papers on bilingual education.
A collection of notes on the history of the Normal College, Bangor, 1958.
Lecture notes for a course on Welsh literature.
Correspondence addressed to Thomas Roberts from the following persons : E. G. Chamberlain, W. Llewelyn Davies, John Jenkins, D. Gwenallt Jones, E. D. Jones, Dr Thomas Parry, Eurys Rowlands, R. J. Thomas and Griffith John Williams.
Off-prints of the articles of Thomas Roberts which appeared in the Bulletin of the Board of Celtic Studies, 1934-1956
Photostat copies of poetry manuscripts from the National Library of Wales, the British Museum and the Bodleian Library.
Original manuscript described as Llandudno MS. It consists of a collection of cywyddau in two hands - one from the end of the 18th century, the other from the beginning of the 19th century. Amongst the various 16th century bards are, Humphrey Dafydd ab Ifan, Humphrey William, Thomas Prys, Edmund Prys, Sion Phylip.