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Type	Originator	Title	Date
	Haigh,D & Cordingley, J	Adventures Underground	2017
	Casteret,N	Au Pays des Eaux Folles
	Waltham,A	Caves	1974
	Burnham,R (ed)	Caves Cliffs and Canyons	2000
	Gillieson,D	Caves; Processes, Development, Management	1996
	Ford,D.C	Characteristics of Limestone Solution in the Southern Rocky Mountains and Selkirk Mountains, Alberta and British Columbia	1971
	Vila,G	Clamouse cavern	1974
	MacInnes,H	Climb to The Lost World	1974
	Geyer,E (ed)	Expedition Gunung Lanno Malaysia	2001
	Shaw,T	Foreign travellers in the Slovene Karst 1537 - 1900	2000
	Jimenez,A.N	Geografia de Cuba	1959
	Caumartin,V	La Conservation des Cavernes Amenagees	1973
	Brunet,P	La Grotte de Saint Marcel d'Ardeche [with DVD and loose survey]	2008
	Trebuchon,J	La saga de l'aven d'orgnac, Issirac	2000
	National Geographic Magazine	Lechuguilla Cave	March 1991
	Trench,R & Hillman,E	London Underground	1994
		Manuale Tecnico di Soccorso Alpino	1991
	Irwin,D.J & Jarrett,A	Mendip Underground	1993
		Monografia Geografica No 6	1931
	Davies,W.T	Now and then vol 5	2010
	Cambrian Archaeological Association [Archaeologia Cambrensis 117, pp.18-71]	Ogof yr Esgyrn	1968
	Dasher,G.R	On Station	1994
	Jasinski,M	Plongees sous la Terre	1965
	Mason,E.J	Portrait of the Brecon Beacons	1975
	Oviglia,M & Vacca,M	Sardegna non Solo Mare
	Margus,D	Speleological Guide to Krka National Park	2013
	Salvayre,Henri	Speleologie et Hydrogeologie des Massifs Calcaires des Pyrenees-Orientales	1977
	Casteret,N	Ten years under the earth	1939
	Quart.Jour.of the Geol.Soc. of London	The Drainage Systems of Wales and the Adjacent Regions	1951
	Allaby,M	The Ordnance Survey Outdoor Handbook	1987
	Walker,T.A	The Severn Tunnel	[1888]
	Hoffman,L	The caves of Karst	1969
	Jones,G	The district of Sennybridge, Trecastle and Defynnog Book 1	1997
	Cornwell-Smith,N	They Words, They Words They 'orrible Words	1993
	Sloane,H. N & Gurnee,R. H	Visiting American Caves	1966