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Sheet 26, Old Series 1". Devon: Okehampton, Hartland on west edge Appledore on north, N.Molton on NE corner. Geological Survey of England & Wales.
Sheet 14, Old Series 1". Covering Bath (NE corner) to Glastonbury (SW corner), 1882. Geological Survey of England & Wales.
Map of the English Lakes and adjoining Country, Geologically Coloured, 1855. Ruthven, John.
Murchison, R.I. (1859). Siluria. The History of the Oldest Fossiliferous Rocks and their Foundations; with a brief sketch of the Distribution of Gold over the Earth, 1859. John Murray.
De la Beche (1851). The Geological Observer, Longmans. Longman et al.
De la Beche, H. T. (1832). A Geological Manual, Treutel and Wurtz, London, 2nd edition. Beche, de la, HT.
De la Beche, Henry T. (1839). Report on the Geology of Cornwall, Devon and West Somerset. Longman et al.
Lyell, Charles (1867-68), Principles of Geology or the Modern Changes of the Earth and its inhabitants, 1867-68. John Murray.
Faujas St.-Fond, B. (1907). A Journey through England and Scotland to the Hebrides in 1794, 1907. Hugh Hopkins.
Voyages aux Iles de Lipari, fait en 1781, ou Notices sur les Iles Aeoliennes, pour server a l’Histiore des Volcans. Academie Royale des Sciences.
Portlock, J.E. (1843). Report on the Geology of the County of Londonderry and of parts of Tyrone and Fermanagh. Longman et al.