NPRNTeitlMath O SaflePerthynasNPRN301519TeitlBog Mine, PonterwydMath O Saflen/aPerthynasAssociated withNPRN33888TeitlPowell's Llywernog Mine, PonterwydMath O Saflen/aPerthynasAssociated withNPRN301518TeitlPonterwyd Lead Mine, PonterwydMath O Saflen/aPerthynasAssociated withNPRN301517TeitlLlywernog Silver Lead Mining Museum, Poole's Llywernog Mine, PonterwydMath O Saflen/aPerthynasAssociated with
