Four holograph letters:- to J. Horsfall Turner from Morris Charles Jones, Welshpool, 1885 (exchange of books on Nonconformist subjects from the recipient's library for the Powys-land Museum and Library), and to E. R. Horsfall Turner from Harold P. Cooke, Cambridge, 1908 (the writer's essay in competition for the Charles Oldham Prize at the University of Oxford, the vacant chair of Greek at University College, Cardiff), and W. H. Robinson, Central Welsh Board, Cardiff, 1910 (C. W. B. inspectors' reports on schools); and one holograph postcard to Mrs. [Hilda Gladys] Turner, County School, Llanidloes, from P. Davies, Llanidloes [1922] (a copy of a translation by the recipient's father).

A notebook containing 'collectanea' of Thomas relating to the diocese of St Asaph, the Church and Nonconformity in Wales, archaeology, pedigrees, poetry, place names, autograph signatures, etc.