Papers of the Rev. C. Tawelfryn Thomas, 1837-1938, comprising letters addressed to him from religious, literary and political figures, 1874-1938, mainly about biographical details of historical and contemporary ministers and poets, eisteddfod competitions, publication of books and articles, including Thomas's own work on Ieuan Gwynedd, the Independent College in Bala, personal matters, preaching engagements and ministers' appointments; stanzas composed by him; and poetry by William Cosslett (Gwilym Elian) and others, 1837-1903.