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    Archive NumberTitleLevelDescriptionMediumImagesArchive Number6511355Title71_059_0010 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Cwm Twrch Uchaf, taken by the Ordnance Survey on 13th April 1971 at an altitude of 7300 feet. Grid reference SN7511. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.ImagesnArchive Number6511374Title71_059_0011 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Cwm Twrch Uchaf, taken by the Ordnance Survey on 13th April 1971 at an altitude of 7300 feet. Grid reference SN7511. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.ImagesnArchive Number6511356Title89_408_0075 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Cwm Twrch Uchaf, taken by the Ordnance Survey on 7th September 1989 at an altitude of 8300 feet. Grid reference SN7511. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.ImagesnArchive Number6511373Title89_408_0079 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Cwm Twrch Isaf, taken by the Ordnance Survey on 7th September 1983 at an altitude of 8300 feet. Grid reference SN7610. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.ImagesnArchive Number6511353Title93_135_0115 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Cwm Twrch Isaf, taken by the Ordnance Survey on 7th May 1993 at an altitude of 8600 feet. Grid reference SN7610. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.ImagesnArchive Number6511354Title93_135_0116 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Cwm Twrch Isaf, taken by the Ordnance Survey on 7th May 1993 at an altitude of 8600 feet. Grid reference SN7610. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.Imagesn