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Amgueddfa Cymru – Museum Wales
Site Name: Crug Mawr Ridges, Black Mountains
Notes: Mynydd Ddu - Capel-y-Ffin, Darren Llwyd a Twmpa Disgrifir gan K. Palmer; "Blaen-yr-Henbant Saddle Blean Yr Henbant Path (Caerleon Convention 1985) Largest close to Quarries and Wall ie near to (side scraper) Blade from field to s. of wall"