Small underground working.*
Publications (3)
- (2002); CATMHS - Newsletter 068-July; 23 pages
- Richards, Alun J. (2004); Slate Quarrying at Corris; pp.70; Gwasg Carreg Gwalch; ISBN 1-84524-068-5
- Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
