NPRNTeitlMath O SaflePerthynasNPRN33889TeitlPowder House, Poole's Llywernog Mine, near PonterwydMath O Saflen/aPerthynasConsists ofNPRN301519TeitlBog Mine, PonterwydMath O Saflen/aPerthynasAssociated withNPRN33888TeitlPowell's Llywernog Mine, PonterwydMath O Saflen/aPerthynasAssociated withNPRN419766TeitlOre Crushing House, Llywernog Lead MineMath O Saflen/aPerthynasConsists ofNPRN301518TeitlPonterwyd Lead Mine, PonterwydMath O Saflen/aPerthynasAssociated withNPRN301520TeitlClara Lead Mine, PonterwydMath O Saflen/aPerthynasAssociated with
