Eifionydd
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- Gwynedd Archives, Caernarfon Record Office
- Gwynedd Archives, Caernarfon Record Office
- Agricultural Co-Operative Trading in Wales: Its Development, Present Structure and Performance
- Thirteenth.Century Farm Economies in North Wales
- A Welsh Classical Dictionary
- The History of Gruffydd Ap Cynan; the Welsh Text
- Hh Gesail Gyfarch
- Llŷn Area of Outstanding Natural Beauty
- Llyfrgell Genedlaethol Cymru = the National Library of Wales Cymorth
- Gwynedd Archives, Caernarfon Record Office
- The Snowdonia Dendrochronology Project
- Llŷn & Eifionydd
- Llys Y Cripil
- A Welsh Classical Dictionary
- An Assessment of the Welsh Language's Situation and The
- NLW MSS 21701-22852 (2) Index
- Gwynedd Archives, Caernarfon Record Office
- 2020Rhydderch-Dartdphd