NPRNTeitlMath O SaflePerthynasNPRN307962TeitlClydach Railroad: Hafod Arch;Bridge over Nant Melyn, BrynmawrMath O Saflen/aPerthynasConsists ofNPRN308651TeitlClydach Railroad: Bridge at Rhonos-Isaf, Maesgwartha, ClydachMath O Saflen/aPerthynasConsists of