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    Archive Number
    6514560
    Description
    Black and white aerial photograph of Porthmadog taken by the Ordnance Survey on 21st May 1971 at an altitude of 7500 feet. Grid reference SH5639. Print enlargement (c. 20") taken from 9" film roll.
    Collection Name
    Ordnance Survey Vertical Aerial Photography Collection
    Medium
    Photo.
    Originator
    Ordnance Survey
    Date
    1971-05-21