NPRNTeitlMath O SafleArchifauDelweddauNPRN417856TeitlYnys y Wern; YnysywernMath O SafleFFERMArchifau13Delweddau9NPRN415277TeitlSouth Wales Electric Company, Upper Boat Power StationMath O SafleGORSAF BŴER LOArchifau16Delweddau12