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Rhif ArchifTeitlLefelDisgrifiadCyfrwngDelweddauRhif Archif6537110Teitl73_082_0499 - Ordnance Survey Vertical Aerial Photography CollectionLefelItemDisgrifiadBlack and white aerial photograph of Maen Offeren Slate Mine, taken by the Ordnance Survey on 17th April 1973 at an altitude of 7,500 feet. Grid reference SH7046. Print enlargement (c. 20") taken from 9" film roll.CyfrwngPhoto.DelweddaunRhif Archif6537109Teitl73_082_0526 - Ordnance Survey Vertical Aerial Photography CollectionLefelItemDisgrifiadBlack and white aerial photograph of Maen Offeren Slate Mine, taken by the Ordnance Survey on 17th April 1973 at an altitude of 7,500 feet. Grid reference SH7046. Print enlargement (c. 20") taken from 9" film roll.CyfrwngPhoto.DelweddaunRhif Archif6537108Teitl73_082_0527 - Ordnance Survey Vertical Aerial Photography CollectionLefelItemDisgrifiadBlack and white aerial photograph of Maen Offeren Slate Mine, taken by the Ordnance Survey on 17th April 1973 at an altitude of 7,500 feet. Grid reference SH7046. Print enlargement (c. 20") taken from 9" film roll.CyfrwngPhoto.DelweddaunRhif Archif6145692Teitl945096_48 - RCAHMW Black and White Oblique Aerial PhotographsLefelItemDisgrifiadRCAHMW Black and white oblique aerial photograph of Maen-offeren Slate Quarry, Ffestiniog, taken by C.R. Musson, 17/04/94CyfrwngPhoto.DelweddaunRhif Archif6145691Teitl94_CS_0722 - RCAHMW Colour Oblique Aerial PhotographsLefelItemDisgrifiadRCAHMW colour slide oblique aerial photograph of Maen-offeren Slate Quarry, Ffestiniog, taken by C.R. Musson, 17/04/94CyfrwngPhoto.DelweddaunRhif ArchifAP2024_065TeitlAP2024_065LefelBatchDisgrifiadAerial photographic survey of Maen Offeren Slate Mine, Blaenau Ffestiniog. Conducted by Toby Driver of RCAHMW, 20 April 2018.Cyfrwng1 .tif file (104 MB). Photographic.DelweddaunRhif ArchifAP2024_065_001TeitlAP2024_065_001LefelItemDisgrifiadMaen-offeren Slate Quarry, wide view from north-east. Oblique aerial photograph taken during the Royal Commission’s programme of archaeological aerial reconnaissance by Toby Driver on 20 April 2018.Cyfrwng1 .tif file. PhotographicDelweddauyRhif Archif6360328TeitlAP_2005_2953 - RCAHMW Colour Oblique Digital Aerial PhotographsLefelItemDisgrifiadRCAHMW colour oblique aerial photograph of Maen-Offeren Slate Quarry, Blaenau Ffestiniog, viewed from the west. Taken on 21 November 2005 by Toby DriverCyfrwngPhoto.DelweddauyRhif Archif6360327TeitlAP_2005_2954 - RCAHMW Colour Oblique Digital Aerial PhotographsLefelItemDisgrifiadRCAHMW colour oblique aerial photograph of Maen-Offeren Slate Quarry, Blaenau Ffestiniog, viewed from the west. Taken on 21 November 2005 by Toby DriverCyfrwngPhoto.DelweddauyRhif Archif6360326TeitlAP_2005_2955 - RCAHMW Colour Oblique Digital Aerial PhotographsLefelItemDisgrifiadRCAHMW colour oblique aerial photograph of Maen-Offeren Slate Quarry, Blaenau Ffestiniog, viewed from the west. Taken on 21 November 2005 by Toby DriverCyfrwngPhoto.Delweddauy