• Cymraeg
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    LevelDescriptionArchiveDateArchive Number
    LevelSub-groupDescriptionPhotos from a geophysical survey of Cwm Ffrydlas and Mynydd Du carried out by Sam Birchall, 2015.ArchiveGeneral Digital Donations CollectionDateArchive Number6441600
    LevelSub-groupDescriptionFinal maps from a geophysical survey of Cwm Ffrydlas and Mynydd Du carried out by Sam Birchall, 2015.ArchiveGeneral Digital Donations CollectionDateArchive Number6441599
    LevelSub-groupDescriptionFieldwork data from a geophysical survey of Cwm Ffrydlas and Mynydd Du carried out by Sam Birchall, 2015.ArchiveGeneral Digital Donations CollectionDateArchive Number6441598