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    Manylion
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    NPRNTeitlMath O SafleArchifauDelweddauNPRN400427TeitlMaenofferen Slate Mine, Blaenau Ffestiniog (Maen-Offeren; Maen y Fferem; Maen Offeren)Math O SafleCHWAREL LECHIArchifau146Delweddau136NPRN416518TeitlWinding House Complex, Maenofferen Slate MineMath O SafleCWT HALIOArchifau23Delweddau23NPRN416517TeitlDressing Mills, Maenofferen Slate MineMath O SafleMELIN LIFIOArchifau41Delweddau41NPRN415911TeitlStorehouse, Maenofferen Slate MineMath O SafleSTORDYArchifau3Delweddau3