An Archaeological Investigation of Early Mineworkings on Copa Hill, Cwmystwyth: New Evidence for Prehistoric Mining.
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[1] C. S. Briggs. Copper Mining at Mount Gabriel, Co. Cork: Bronze Age Bonanza or Post-Famine Fiasco? , 1983, Proceedings of the Prehistoric Society.
[2] E. N. Cernych. Aibunar—a Balkan copper mine of the fourth millennium BC: (Investigations of the years 1971, 1972 and 1974) , 1978, Proceedings of the Prehistoric Society.