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Keywords: Quarterly Journal of the Geological Society of London, vol. 33 no. 12 fig. 2.png en Fig 2 from On the Silurian Grits of Corwen North Wales in Quarterly Journal of the Geological Society of London vol 33 1877 https //archive org/details/quarterlyjourna331877geol Thomas McKenny Hughes 1832 “1917 other versions PD-old-70-1923 Quarterly Journal of the Geological Society of London Volume 33 Uploaded with UploadWizard |