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
Famous quotes containing the words external and/or links:
“Truth in philosophy means that concept and external reality correspond.”
—Georg Wilhelm Friedrich Hegel (1770–1831)
“I’ve gradually risen from lower-class background to lower-class foreground.”
—Marvin Cohen, U.S. author and humorist. Baseball the Beautiful, Links Books (1970)