Trial
Publications (3)
- Gwyn, David, (2015); Welsh Slate: archaeology and history of an industry; Royal Commission on the Ancient and Historical Monuments of Wales; 9781871184518
- Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
- Richards, Alun John, (1999); The Slate Regions of North and Mid Wales and their Railways; Gwasg Carreg Gwalch; 0863815808
