NPRNTeitlMath O SaflePerthynasNPRN40593TeitlCroesor Slate QuarryMath O Saflen/aPerthynasAssociated withNPRN400884TeitlBwlch-y-Rhosydd, Tramway (Including Incline)Math O Saflen/aPerthynasAssociated withNPRN33745TeitlCroesor Slate Quarry, Power HouseMath O Saflen/aPerthynasAssociated withNPRN40600TeitlRhosydd Slate QuarryMath O Saflen/aPerthynasAssociated with
