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Richards, Alun John (1999). The Slate Regions of North and Mid Wales and Their Railways. Wales: Carreg Gwalch. ISBN 0863815529. OCLC 59415611.
Richards, Alun John (1999). The Slate Regions of North and Mid Wales and Their Railways. Wales: Carreg Gwalch. ISBN 0863815529. OCLC 59415611.