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.

Papers of the family of Jones and Pughe-Jones of Ynysgain, Cricieth, Caernarfonshire, 1501-[c. 1955], including deeds, mostly relating to the Cricieth area and to Merionethshire, 1501-1890; and an account book, 1614-1918.