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    Archive NumberTitleLevelDescriptionMediumImagesArchive Number6201139Title115_78_020112 - Ordnance Survey Aerial Photography CollectionLevelItemDescriptionDigitized copy of an aerial photograph showing Ystradgynlais area, taken for Ordnance Survey, 1978MediumPhoto.ImagesyArchive Number6201138Title115_78_020113 - Ordnance Survey Aerial Photography CollectionLevelItemDescriptionDigitized copy of an aerial photograph showing Ystradgynlais area, taken for Ordnance Survey, 1978MediumPhoto.ImagesyArchive Number6511365Title69_306_0111 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Ystradgynlais, taken by the Ordnance Survey on 29th June 1969 at an altitude of 8500 feet. Grid reference SN7910. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.ImagesnArchive Number6202723Title810197 - NMR Site FilesLevelItemDescriptionCopy of an early black and white photograph showing workers housing in Ystradgynlais.MediumPhoto.ImagesnArchive Number6511437Title89_408_0113 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Ystradgynlais, taken by the Ordnance Survey on 7th September 1989 at an altitude of 8300 feet. Grid reference SN7810. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.ImagesnArchive Number6511366Title89_408_0119 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Ystradgynlais, taken by the Ordnance Survey on 7th September 1989 at an altitude of 8300 feet. Grid reference SN7910. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.ImagesnArchive Number6511367Title89_408_0120 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Ystradgynlais, taken by the Ordnance Survey on 7th September 1989 at an altitude of 8300 feet. Grid reference SN7910. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.ImagesnArchive Number6201115Title89_408_121 - Ordnance Survey Aerial Photography CollectionLevelItemDescriptionDigitized copy of an aerial photograph showing the Ystradgynlais area, taken by Ordnance Survey, 1989.MediumPhoto.ImagesyArchive Number6511435Title93_135_0111 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Ystradgynlais, taken by the Ordnance Survey on 7th May 1993 at an altitude of 8600 feet. Grid reference SN7810. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.ImagesnArchive Number6511436Title93_135_0112 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Ystradgynlais, taken by the Ordnance Survey on 7th May 1993 at an altitude of 8600 feet. Grid reference SN7810. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.Imagesn