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    Manylion
    Hierarchaeth
    Safleoedd Cysylltiedig
    Rhif Archif
    6482432
    Disgrifiad
    Black and white photo survey showing Pwll Du Tunnel, north portal, taken by Iain Wright, 23rd January 1992.
    Enw Casgliad
    NMR Site Files
    Cyfrwng
    4 photos. Photo.
    Cychwynnwr
    Iain N. Wright, RCAHMW
    Dyddiad
    1992-01-23