Chwarel y Penrhyn, by W. J. Roberts
Decorated Slates of Dyffryn Ogwen
Rhognant Quarry
Esgairfoeleirin Quarry
Rhiwgreiddyn Quarry
Nantlle Valley and slate quarries
Penrhyn Quarry
Caernarfon
Llanberis
Blaenau Ffestiniog
Cwmorthin Valley Quarries and mines
Introducing Falcon Hildred
The End of the Line