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2. Archives and Records , The Great North Museum: Hancock Museum, Newcastle-upon-Tyne, UK. A Museum of Tyne and Wear Archives and Museums and of Newcastle University and personal correspondence, Ms Sylvia Humphrey, Assistant Keeper of Geology, Great North Museum.
3. Barton D. B. (1968) A History of Copper Mining in Cornwall and Devon (D. Bradford Barton Ltd, Truro).
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5. Bartrip P. W. J. (2001) The Way from Dusty Death: Turner and Newall and the Regulation of Occupational Health in the British Asbestos Industry, 1890s–1970 (Athlone Press, London).