Photograph of Owen Roberts
Names of Dyffryn Nantlle Slate Quarries Artwork
Hanes y Llan
Nantlle Railway tunnel, Dorothea Quarry
Inscription of JER with a partial date
Dororthea Quarry Beam Engine
excavation at 27 Caroline St, Fernhill,...
Penyrorsedd
Dorothea Quarry Boilers
underground in Dinas Silica mine
underground at Dinas Silica Mine
Underground at Dinas Silica Mine