Miscellanea, including anecdotes, memoranda, notes on Criccieth, the Litany and the parish of Trefeglwys, 'Anhebgorion eisteddfod lwyddiannus', 'Derwyddiaeth a Derwyddion', 'Y moddion gorau i sicrhau cylchrediad helaethach i'r Llan', etc.
A letter dated 28 April 1925 from J. Rhosydd Williams, Rhosllannerchrugog to Sir John Ballinger (1860-1933), first librarian of the National Library of Wales, containing information about William Jones, chandler, Porthmadog, who founded a Church of Christ at Porthmadog, and also particulars about the Scottish Baptists church at Criccieth and about Dr W. Jones Williams, Middlesborough.
Williams, J. Rhosydd, Rhosllannerchrugog Letter from (1925), NLW MS 5978C