A ledger, 1880-1907, of Richard Jones, builder, contractor, and wheelwright, of Twrog Mill, Llanwnda, Caernarvonshire. Some of the accounts relate to the 'Book Depository', Caernarvon, to the Fletcher Slate Yard, Caernarvon, to Penyrorsedd Slate Company, and to schools and Nonconformist meeting-houses in the county.