A duplicate copy book by W. J. Parry containing copies of letters, 1923; lists of music plates and sheet music; a list of letters presented by W. J. Parry to the Carmel Chapel Library, Llanllechid, 1923; lists of Cefnfaes estates leases expiring in 1923; letters for the press entitled 'Helynt Llanberis, 1885-6' and 'Helynt Dinorwic 1885-6'.

A report by J. J. Evans on the Moel Faban Slate Quarry, 1887, and on the Capel Curig Slate Quarry, 1889; papers relating to schemes for working an iron ore deposit at Bettws Garmon, Caernarvonshire, 1891; a note on the Capel Curig Slate Co.; a report by John Menzies on the Moel Faban Slate Quarry, 1903; a minute relating to the lease of Pantdreiniog quarry, 1904; memorandum of the deposit of the Moel Faban lease with Lloyd's Bank Ltd, 1906; memoranda of negotiations with the Cefnfaes estate, 1919-1922; an inventory of the moveable plant of the North Wales Development Co. Ltd at Bethesda, 1921; correspondence between George Macdonald and W. J. Parry for the sale of the Moel Faban Green Slate Quarry, 1923; and correspondence and statutes relating to the Slate Milling Corporation at Pantdreiniog and Moel Faban.