Cymdeithas Archaeoleg a Hanes Ll欧n Canllaw Treftadaeth 2014
Sefydliadau Treftadaeth Cymru: Ymddiriedolaeth Archaeolegol Gwynedd Craig Beuno Ffordd y Garth Bangor Gwynedd LL57 2RT http://www.heneb.co.uk/
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Comisiwn Brenhinol Henebion Cymru - RCAHMW http://www.rcahmw.gov.uk/ The Royal Commission on the Ancient and Historical Monuments of Wales, Library and Enquiries Service, National Monuments Record of Wales, Plas Crug, Aberystwyth,