Letters mainly addressed to H. Cernyw Williams by Elias H. Jones, Llangernyw, 1905, Henry Jones, Glasgow, 1897-1921, Charles Davies, Liverpool and Cardiff, 1883-1925, Thomas Charles Edwards, Aberystwyth and Bala, 1886-1895, C. H. Spurgeon, 1887-1888, and Owen Thomas, Newtown (to John Williams at Pwllheli), 1849.
Reviews of Owen Davies and H. Cernyw Williams: Efengyl Ioan gyda Rhagarweiniad a Nodiadau, 1899-1900, and H. Cernyw Williams: Yr Arweinydd Dwyfol, 1907, and letters relating to the same works from Charles Davies, Cardiff, David Davies, Llandudno, J. M. Davies, Cardiff, D. Tecwyn Evans, Portdinorwic, W. Hobley, Bontnewydd, Gwilym H. Havard, London, John Hughes, Pwllheli, John Hughes, Liverpool, R. Humphreys, Liverpool, H. T. Jacob, Peniel, J. Cynddylan Jones, Cardiff, Rees Jenkin Jones, Aberdare, R. G. Roberts, Caernarvon, and Peter Williams ('Pedr Hir'); and a letter, 1878, from Robert Thomas ('Ap Vychan'), in appreciation of H. Cernyw Williams: Hynafiaethau Edeyrnion.