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Mather, John D. (ed.)(2004). 200 Years of British Hydrogeology. London: Geological Society Special Publication 225. 393pp. 1st edition. Hardback. Geological Society of London.
Portlock, JE (1869). Memoir of the Life of Major-General Colby, together with a Sketch of the Origin and Progress of the Ordnance Survey of Great Britain and Ireland: . Skeely Jackson.