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    Manylion
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    NPRNTeitlMath O SaflePerthynasNPRN408412TeitlOld Incline, Cwmorthin Slate QuarryMath O Saflen/aPerthynasAssociated withNPRN408417TeitlLake to Mill Incline, Cwmorthin Slate QuarryMath O Saflen/aPerthynasAssociated withNPRN408411TeitlCompressor House, Cwmorthin Slate QuarryMath O Saflen/aPerthynasAssociated withNPRN408410TeitlLake Mill, Cwmorthin Slate QuarryMath O Saflen/aPerthynasAssociated withNPRN420832TeitlFfestiniog Slate CompanyMath O Saflen/aPerthynasPart ofNPRN408415TeitlMain Incline, Cwmorthin Slate QuarryMath O Saflen/aPerthynasAssociated withNPRN408414TeitlIncline Drum House, Cwmorthin Slate QuarryMath O Saflen/aPerthynasAssociated withNPRN400887TeitlTan y Grisiau Incline;Village Incline, Cwmorthin Slate QuarryMath O Saflen/aPerthynasAssociated withNPRN408413TeitlOld Magazine, Cwmorthin Slate QuarryMath O Saflen/aPerthynasAssociated withNPRN408416TeitlTerraced Spoil Tips, Cwmorthin Slate QuarryMath O Saflen/aPerthynasAssociated withNPRN408418TeitlLake Level Tip, Cwmorthin Slate QuarryMath O Saflen/aPerthynasAssociated with