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North Wales quarries

Reports on Pen-y-Bryn Slate Quarry, Nantlle by G P Jones; Pen yr Orsedd, Plas Tan-y-Bwlch, August 1996; Tal-y-Sarn by Roy Gregory and Peter Swift, 1999. Notes and research on Blaen y Cwm, Croesor, Gwydir, Gorsedda and Ynys y Pandy, Maen Offeren, Pant yr Ynn, Penarth, Votty and Bowydd; Wrysgan.