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Type	Originator	Title	Date
	Fogg, P & T	Beneath our Feet, The caves & Limestone scenery of the North of Ireland	2001
	Nymeyer,R & Halliday,W.R	Carlsbad Cavern The Early Years	1991
	Deflandre,G	Han sur Lesse et ses Grottes	1989
	Jahan,L	Magie des Gouffres	1993
	Balch,H.E	The Mendip caves	1947