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The Quarterly journal of the Geological Society of London . Qyxu Jaurrv Geob Soc Vol JL PbJXL GEOLOGICAL SKETCH MAP OF THE Island of GuERisrsEY Si BorrMmde Gahbrc BvrdB fe Diarit and Syenites ' Gneiss Pl XX Illustration biodiversitylibrary org Geological Society of London Biodiversity Heritage Library The Quarterly journal