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Lewis, Michael Jonathan Taunton (2003). Blaen y Cwm and Cwt y Bugail Slate Quarries. Mold, N Wales: Adit Publications. ISBN 9780952297932. OCLC 55964065.
Lewis, Michael Jonathan Taunton (2003). Blaen y Cwm and Cwt y Bugail Slate Quarries. Mold, N Wales: Adit Publications. ISBN 9780952297932. OCLC 55964065.