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    Rhif ArchifTeitlLefelDisgrifiadCyfrwngDelweddauRhif Archif6426973Teitl2001-0134 - Investigators' PhotographsLefelBatchDisgrifiadPenrhyn Slate Quarry, Incline remains: Photo survey comprising 1 B&W print taken by S. R. Hughes, June 2001.Cyfrwng1 print. Photo.DelweddaunRhif Archif6426974Teitl2001-0134 - Investigators' PhotographsLefelItemDisgrifiadView of incline remains to N Tips from NE, Penrhyn Slate Quarry.CyfrwngPhoto.DelweddaunRhif Archif6514547Teitl68_157_0348 - Ordnance Survey Vertical Aerial Photography CollectionLefelItemDisgrifiadBlack and white aerial photograph of Penrhyn Slate Quarry taken by the Ordnance Survey on 9th June 1968 at an altitude of 7500 feet. Grid reference SH6265. Print enlargement (c. 20") taken from 9" film roll.CyfrwngPhoto.DelweddaunRhif Archif6198858Teitl71_212_130 - Ordnance Survey Aerial Photography CollectionLefelItemDisgrifiadDigitized copy of an aerial photograph showing Penrhyn Slate Quaryy, taken by Ordnance Survey, 1971.CyfrwngPhoto.DelweddauyRhif Archif6198857Teitl71_212_131 - Ordnance Survey Aerial Photography CollectionLefelItemDisgrifiadDigitized copy of an aerial photograph showing Penrhyn Slate Quaryy, taken by Ordnance Survey, 1971.CyfrwngPhoto.DelweddauyRhif Archif6297911Teitl804009 - NMR Site FilesLefelItemDisgrifiadPenrhyn QuarryCyfrwngPhoto.DelweddaunRhif Archif6270596Teitl804010 - NMR Site FilesLefelItemDisgrifiadPenrhyn QuarryCyfrwngPhoto.DelweddaunRhif Archif6305137Teitl804011 - NMR Site FilesLefelItemDisgrifiadPenrhyn QuarryCyfrwngPhoto.DelweddaunRhif Archif6297912Teitl804012 - NMR Site FilesLefelItemDisgrifiadPenrhyn Quarry, slate-cutter at workCyfrwngPhoto.DelweddaunRhif Archif6270597Teitl804013 - NMR Site FilesLefelItemDisgrifiadPenrhyn Quarry, slate-cutter at workCyfrwngPhoto.Delweddauy