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Type	Originator	Title	Date
	Hierro,J. G	Aventura por la comarca del Ason	2001
		British Mesozoic fossils	1967
	IBID.	Journal of the Czechoslovak Geographical Society(XX Int.Geo.Cong.
	Rippon,S, Claughton,P & Smart,C	Mining in the Medieval Landscape	2009
	Caumont,D	Monts et Grottes de Saint Guilhem	1993
	Baker,E.A	Moors crags and caves of the high Peak	1903
	RGS Geographical Magazine	Quest for Caves in High Nepal	1971
	Pernette,J-F	Rivieres sous la Pierre	1983
	Jones,O.T	Special Reports on the Mineral Resources of Great Britain Vol	1922
	Jones,O.T	Special Reports on the Mineral Resources of Great Britain Vol	1922
	Hodgkiss,Peter	The Central Highlands	1984