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    Archive Number
    6514535
    Description
    Black and white aerial photograph of Pen yr Orsedd Slate Quarry taken by the Ordnance Survey on 25th April 1973 at an altitude of 7500 feet. Grid reference SH5154. Print enlargement (c. 20") taken from 9" film roll.
    Collection Record
    Ordnance Survey Vertical Aerial Photography Collection
    Medium
    Photo.
    Originator
    Ordnance Survey
    Date
    1973-04-25