External Links
- History and photos
- “The Penrhyn Slate Quarry,” in Saturday Magazine, No. 12, September 8th, 1832, pp. 93.
- The Penrhyn Slate Quarries in North Wales circa 1858, in The Illustrated London News, Vol. XXXII, No. 913, Saturday, April 17, 1858, pp. 392-393.
Read more about this topic: Penrhyn Quarry
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