Names of Dyffryn Nantlle Slate Quarries Artwork
Memories of Dyffryn Nantlle, John Gruffydd...
Memories of Dyffryn Nantlle (3)
Memories of Dyffryn Nantlle (2)
Hanes y Llan
Nantlle Railway tunnel, Dorothea Quarry
Inscription of JER with a partial date
Dororthea Quarry Beam Engine
Penyrorsedd
underground in Dinas Silica mine
underground at Dinas Silica Mine
Underground at Dinas Silica Mine