Archive6516737Title72_414_0233 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Porthyrhyd, taken by the Ordnance Survey on 15th September 1972, at an altitude of 7,200 feet. Grid reference SN5115. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.Imagesn
Archive6516757Title87_030_0087 - Ordnance Survey Vertical Aerial Photography CollectionLevelItemDescriptionBlack and white aerial photograph of Porth-y-rhyd, taken by the Ordnance Survey on 22nd April 1987, at an altitude of 8,000 feet. Grid reference SN5115. Print enlargement (c. 20") taken from 9" film roll.MediumPhoto.Imagesn
