1. E.A. Martel, Speleology, in: J.S. Keltie and H.R. Mill (Eds), Report of the Sixth International Geographical Congress. Held in London, 1895, London, 1896, 717–722. Trevor Shaw suggests that the word ‘speleologie’ was invented during the 1880s, purportedly by Emile Rivière, a French pre-historian. ‘Speleology’ became the popular term used to describe the study of caves; however its use was less widespread within Britain at that time. T.R. Shaw, History of Cave Science: The Study and Exploration of Limestone Caves, to 1900, Sydney, 1992, 2.
2. Martel, Speleology, 717.
3. Review of the Sixth International Geographical Congress;Anon;Geographical Journal,1895
4. The British Speleological Association;Palmer;Caves and Caving,1937
5. Eli Simpson – 16 September 1884 to 1 February 1962. A Biography up to 1945;Craven;Studies in Speleology,1991