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    Archive NumberTitleLevelDescriptionMediumImagesArchive Number6514417Title73_020_0110 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Bethesda-Bach, taken by the Ordnance Survey on 21st March 1973 at an altitude of 8000 feet. Grid reference SH4656. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.Imagesn