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    Digital image of portal of Halkyn Deep Level, with earlier (1818) inscription above - Williams, 1980Digital image of photo of 'beehive' shaft capping at Rhesycae on Halkyn - CJ William, 1980Digital image of aerial photo showing alignment of shafts on veins at Halkyn Mt  - Musson, 1994Digital image of opencast rake working on Halkyn Mt., this possibly pre-dates Late Medieval - Early Medieval shafts sunk on the vein - Musson 'Wales from the Air' RCAHMW, 1994

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