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- Development of World Cave Diving. Vertebrate Graphics Limited. ISBN 9781910240748. "Caving in the UK: 'The last true wilderness'". BBC. 2018-07-15. Retrieved...19 KB (2,070 words) - 11:17, 10 February 2023
- Development of World Cave Diving. Vertebrate Graphics Limited. ISBN 9781910240748. Archived from the original on 2024-01-30. Retrieved 2020-09-22. Ward...15 KB (1,717 words) - 12:19, 6 April 2024
- and development of world cave diving. Vertebrate Publishing. ISBN 978-1-910240-74-8. scintilena (7 January 2024). "Xavier Meniscus stabilisce il nuovo...100 KB (12,432 words) - 20:00, 12 May 2024
- The Darkness Beckons. Sheffield: Vertebrate publishing. p. 51. ISBN 978-1-910240-74-8. Farr, Martyn (1991). The Darkness Beckons. London: Diadem Books....151 KB (16,392 words) - 11:27, 24 April 2024