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    NPRNTeitlMath O SaflePerthynasNPRN505687TeitlBryn-Mawr, Trial Mine IIIMath O Saflen/aPerthynasConsists ofNPRN505563TeitlBryn-Mawr, Slate Quarry, Labourers Shelter XMath O Saflen/aPerthynasConsists ofNPRN505566TeitlBryn-Mawr, Slate Quarry, Quarry Building IIIMath O Saflen/aPerthynasConsists ofNPRN505553TeitlBryn-Mawr, Slate Quarry, Labourers Shelter IVMath O Saflen/aPerthynasConsists ofNPRN505565TeitlBryn-Mawr, Slate Quarry, Quarry Building IIMath O Saflen/aPerthynasConsists ofNPRN505685TeitlBryn-Mawr, Trial Mine IIMath O Saflen/aPerthynasConsists ofNPRN505562TeitlBryn-Mawr, Slate Quarry, Quarry Building IMath O Saflen/aPerthynasConsists ofNPRN505683TeitlBryn-Mawr, Slate Quarry, Quarry Building IVMath O Saflen/aPerthynasConsists ofNPRN505552TeitlBryn-Mawr, Slate Quarry, Labourers Shelter IIIMath O Saflen/aPerthynasConsists ofNPRN505551TeitlBryn-Mawr, Slate Quarry, Labourers Shelter IIMath O Saflen/aPerthynasConsists ofNPRN505557TeitlBryn-Mawr, Slate Quarry, Labourers Shelter VIIIMath O Saflen/aPerthynasConsists ofNPRN505686TeitlBryn-Mawr, Slate Quarry, Quarry Building VIMath O Saflen/aPerthynasConsists ofNPRN505684TeitlBryn-Mawr, Trial Mine IMath O Saflen/aPerthynasConsists ofNPRN505680TeitlBwlch-y-Groes, Trial MineMath O Saflen/aPerthynasConsists ofNPRN505535TeitlBryn-Mawr, Slate Quarry, Labourers Shelter IMath O Saflen/aPerthynasConsists ofNPRN505534TeitlBryn-Mawr, Slate Quarry IIMath O Saflen/aPerthynasConsists ofNPRN505564TeitlBryn-Mawr, Slate Quarry, Wall IIMath O Saflen/aPerthynasConsists ofNPRN505556TeitlBryn-Mawr, Slate Quarry, Labourers Shelter VIIMath O Saflen/aPerthynasConsists ofNPRN505558TeitlBryn-Mawr, Slate Quarry, Labourers Shelter IXMath O Saflen/aPerthynasConsists ofNPRN505531TeitlDonen Las, Slate QuarryMath O Saflen/aPerthynasConsists ofNPRN505554TeitlBryn-Mawr, Slate Quarry, Labourers Shelter VMath O Saflen/aPerthynasConsists ofNPRN505778TeitlBryn Mawr, Slate Quarry IIMath O Saflen/aPerthynasConsists ofNPRN505555TeitlBryn-Mawr, Slate Quarry, Labourers Shelter VIMath O Saflen/aPerthynasConsists of