Llythyrau at Hugh Cernyw Williams,
- NLW MS 9859C.
- Ffeil
- 1875-1934.
Letters addressed to Hugh Williams ('Hywel Cernyw') by E. T. Jones, Llwyn-y-pia and Llanelli, 1895-1934, Evan Jones, Foel y Crio, 1878-1890, and [Sir] John Rhys, Rhyl and Oxford, 1875-1897.