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Type	Originator	Title	Date
	Woodcock,N.H & Bassett,M.G (Eds.)	Geological Excursions in Powys	1993
	Kowalski,K	Jaskinie Polski 1	1951
	Timperman,M	La Grotte de Han	1989
	Somersetshire Arch.& Nat.Hist.Soc	Proceedings Vol LXXII	1927
	Institute of Geography,Brno	Studia Geographica 5	1969
	Gautier,B & Lord,A	Terre Sauvage	2011
	Oldham,T	The Mines of the Forest of Dean	2005
	Jackson,G. F	Wyandotte cave	1953