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    Archive NumberTitleLevelDescriptionMediumImagesArchive Number6516447Title94_314_0023 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Derwydd, taken by the Ordnance Survey on 2nd September 1994 at an altitude of 8,000 feet. Grid reference SN6217. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.Imagesn