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Type	Originator	Title	Date
		10th International Congress of Speleology (Vol 3)	1989
	Royse,J	Ancient Castleton Caves	1944
	Lascu,C	Caves Beyond Time
	Waltham,T & Lowe,D (editors)	Caves and Karst of the Yorkshire Dales Vol 2	2017
	Lascu. C	Caves beyond Time	2001
	Arculus,R.J	Geology Around Craig-y-Nos	1970
	Leitheim,H	Hohlen der Nordlichen Kalkalpen	1977
	Forbes,I	Images of Industry	2015
	Irwin,D.J & Knibbs,A.J	Mendip Underground	1977
	Casteret,N	Mes cavernes	1940
	Stewart,R. J	Mine Pumping Engines in 18th Century Cornwall	2017
	Lawton,P & Edwards,H	Moelferna Quarry & the Deeside Tramway	2015
	Buduran,S.E	Pestera Ciclovina Uscata Ciclovina Dry cave	2014
	Sopincean,A. C	Pestera Sura Mare - Sura Mare cave	2015
	Henderson,K	Prehistoric man	1927
	Nougier, L.R	Rouffignac	1978
	Moore,G.W & Sullivan,S	Speleology, Caves and the Cave Environment
	Oldham,T	The Caves of West Wales	1979
	Kelly,D	The Red Hills	1994
	Bedford,B	Underground Britain	1985