Minllyn village & quarry ,1930s
Abergynolwyn 1903
Abergynolwyn, village and incline
Gwaith y Fron spoil heap
'The Carved Slates of Dyffryn Ogwen 1830...
Photocopy of rubbing of carved slate
Penrhyn Slate Quarries, Bethesda 1904
Drawing by Falcon Hildred. Tŷ Uncorn, 1978. FHA...