A manuscript by John Jones ('Myrddin Fardd') containing an introductory chapter ('Rhagymadrodd Enwogion') on the worthies of Llŷn and Eifionydd (subsequently amended in turn to Eifionydd and to Caernarvonshire), together with additional notes and press cuttings on the subject. One of the labels on the outer upper cover is numbered '13' and another is inscribed 'Eben Fardd .... ac Enwogion amryw'.

Three notebooks in the hand of John Jones ('Myrddin Fardd') containing material on the worthies of Llŷn and Eifionydd, together with additional press cuttings of more general reminiscences and biographies of Welsh and Welsh American worthies. There are labels on the outer upper covers lettered respectively 'G', 'R', and 'W'.

Papers, 1814-1858, relating to the Llŷn and Eifionydd and the Tremadog Auxiliaries of the British and Foreign Bible Society; names of members and other particulars relating to 'Cymdeithas Eifionydd er cospi ... Drwgweithredwyr', 1829; names of incumbents of churches in the deanery of Eifionydd, 1389-1827; etc.

Papers of Ellis Davies, 1889-1939, comprising his diaries, journals, correspondence, press cuttings, addresses, articles and memoirs, together with printed and typescript memoranda, reports, policy documents and official publications, including relating to the disestablishment and disendowment of the Church in Wales, 1911-1927, the Liberal land enquiry committee, 1913-1925, foreign policy, 1930s, and the Calvinistic Methodist Bill, 1933. Also included are articles and galley proofs for a volume of reminiscences, Pobl a phethau 1906-36, intended for publication but not published by Llyfrau'r Dryw, 1946, and a notebook belonging to Sir Idris Foster containing notes from Davies's journals and papers [?1960s].

A notebook marked 'Copy No 1' containing an account of the hundred of Eifionydd followed by the beginning of an account of the hundred of Llŷn or Lleyn and a note on 'Dinas a Llys Dinorwig' by Peter Bayley Williams, Llanrug (cf. Y Gwyliedydd, 1835, 310), this last in the autograph of John Jones ('Myrddin Fardd'). The material on Eifionydd bears a resemblance to 'Hanes Eifionydd' by W. Jones ('Bleddyn'), Llangollen (see Y Geninen, 1883, p. 59; 1884, pp. 69, 300) but the hand is probably that of 'Myrddin Fardd' at an early period of his life. Loose inside, pasted on a card, is a press-cutting concerning Enwau Lleoedd Sir Gaernarfon (see Cwrtmawr MS 564).

A volume lettered 'Hanesion Llyn ac Eifionydd', being a collection compiled by John Jones ('Myrddin Fardd') of literary, historical and antiquarian material relating mainly to South Caernarvonshire. The collection is partly in the form of notes and extracts in the compiler's hand and partly of mounted cuttings, 1838-1900 and undated, from Yr Herald Cymraeg, Y Genedl Gymreig, Yr Eifion, Yr Arweinydd, Yr Haul, Yr Ymofynydd, Y Winllan, Y Gwladgarwr, Archaeologia Cambrensis, Dysgedydd y Plant, Trysorfa Y Plant, Y Geiniogwerth, Y Brython ('Cyntaf'), Y Wawr ('Americanaidd'), Columbia, Y Goleuad, North Wales Chronicle, Y Cronicl, Y Protestant, Baner ac Amserau Cymru, Y Drych, Seren Gomer, Papur Pawb, etc. The following is a representative collection of titles: 'Llynau'r Ddwyfor', 'Plwyf Abererch', 'Plwyf Llangybi', 'Plwyf Llanarmon', 'Hen dai yn mhlwyf Llanbedrog', 'Pont Rhyd-y-Croesau', 'Talhenbont', 'Cyfarfod Llenyddol Pwllheli' (1857), 'Llenyddiaeth Lleyn ac Eifionydd', 'Caer Fenlli', 'Ynys Enlli', 'Ysgol Sul gyntaf sir Gaernarfon', 'Taith dros yr Eifl', 'Aberdaron: Trem ar ddechreuad yr achos [Wesleaidd] yn y lle', 'Y Nadolig yn Lleyn', 'Dinlleyn', 'Adgofion boreu oes am Pwllheli a'r gymydogaeth', 'Ymweliad a Galltraeth ...', 'Ffynonau cysegredig Cymru', 'Taith drwy Lleyn ac Eifionydd', 'Tyddyn y Llan, Llangybi', 'Elusendai Llangybi ...', 'Llanystymdwy a'i hynodion', 'Cofiant Dewi Wyn ...', 'Mangofion barddonol', 'Adgofion ieuenctyd [am Dremadog]', 'Cymdeithas Ddarllen Porth Madog, i Forwyr, Crefftwyr, ac eraill', 'Cymdeithas Lenyddol Eifionydd', 'Hanesion Eifionydd (O Draethawd Buddugol Ynys-y-Pandy)', 'Hanes Plwyf Llanystumdwy', etc.