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    Manylion
    Hierarchaeth
    Safleoedd Cysylltiedig
    Rhif Archif
    6044873
    Disgrifiad
    Early to mid 20th Century, Ordnance Survey, 25" drawn revision maps, covering nearly all of Wales, except for most of Montgomeryshire.
    Enw Casgliad
    25' Second Edition O.S. Master Maps
    Cyfrwng
    67 drawers. Cartographic.
    Cychwynnwr
    Ordnance Survey
    Dyddiad
    1904 to 1943