NPRNTeitlMath O SaflePerthynasNPRN32443TeitlLake Vyrnwy Straining Tower, LlanwddynMath O Saflen/aPerthynasAssociated withNPRN309728TeitlLake Vyrnwy Dam, Tramway SystemMath O Saflen/aPerthynasAssociated withNPRN308781TeitlHendre QuarryMath O Saflen/aPerthynasAssociated with
