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    RCAHMW colour oblique aerial photograph of Maen-Offeren Slate Quarry, Blaenau Ffestiniog, viewed from the west. Taken on 21 November 2005 by Toby DriverFurther Information
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    NPRN400427TitleMaenofferen Slate Mine, Blaenau Ffestiniog (Maen-Offeren; Maen y Fferem; Maen Offeren)Type Of SiteSLATE QUARRYCollections144Images135