Essays and addresses by William John Parry, Bethesda:- 'Gwroldeb'; 'Cyfarchiad i Ieuengctid'; 'Egwyddorion Cynnulleidfaoliaeth'; 'Egwyddorion Llwyddiant Llafur'; 'Y Cload allan yn y Penrhyn, 1901'; 'Mr. Young a Lord Penrhyn'; 'Robert Parry, Bethesda'; 'Arddel Crist neu Aelodaeth Eglwysig'; 'Perthynas y Cristion a'r Eglwys weledig ar y ddaear'; 'Yr Adfywiad Cymdeithasol, - Ei Beryglon'; and sermons.
Records relating almost entirely to the management and accounting of funds, payments by and to members, payments by and between lodges and the Unity, to investments and to the general rules conducting District and Lodge affairs.
Independent Order of Odd Fellows. Manchester Unity Friendly Society. Gwalia District.
Gwasg Llangollen, ei hanes a'i Llyfryddiaeth gan y Parchedig J. Gwyddno Williams . (Gynt J. Gwyddno Williams MS.) Byrddau. Rhoddwyd gan y Parchedig D. Wyre Lewis, Pen-y-cae, 1951.
Records of Gwasg y Brython, 1758-1977, including sample books, 1912-1967; printer's specimen books, [c. 1920]-[c. 1974]; manuals and catalogues, [1920s]-[c. 1950]; miscellaneous publications, 1928-1965; printer's blocks and photographs, 1887-1934; miscellaneous family and business papers, 1812-1977; and books owned by William Barnad, 1758-1862.
Gweddau Cyfreithiol Hanesiaeth Eglwysig ... gan y Parchedig J. Gwyddno Williams. (Gynt J. Gwyddno Williams MS.) Byrddau. Prynwyd oddi wrth y Parchedig J. Gwyddno Williams, Llannefydd, 1948.
'A Sketch of Life and Literary Labours of [Robert John Pryse] Gweirydd ap Rhys' written 'by my daughter Grace, in 1866'. A copy, in the same hand, of an undated covering letter from 'Gweirydd ap Rhys' to [Thomas Gruffydd] ('Tavalaw') indicates that the 'Sketch' was prepared with a view to the formation by 'Tavalaw' of a petition for a 'Civil Annual Grant' for 'Gweirydd ap Rhys'.
Dwy eitem deipysgrif gan Dafydd Guto Ifan, sef llyfryddiaeth ddetholedig Ted Breeze Jones (1929-1997) a thraethawd yn dwyn y teitl 'Gwenffrwd - Thomas Lloyd Jones (1810-1834)' a wobrwywyd yn Eisteddfod Bro Treffynnon 2000; ynghyd รข chopi o feirniadaeth G. Wyn Owens.
Llyfryddiaethau Caradog Prichard, D. Tecwyn Evans, Dr Lewis William Lloyd (1939-1997), Elizabeth Watkin-Jones ac Albert Evans-Jones (Cynan) wedi'u paratoi gan Dafydd Guto Ifan, rhwng 2004 a 2013, ynghyd ag erthygl ganddo yn dwyn y teitl 'Ffynonellau: Y Ffilm: The Inn of [the] Six[th] Happiness (1958)', Tachwedd 1958.