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Type	Originator	Title	Date
	Readers Digest	(Readers Digest)
	Isherwood,G	Cwmorthin Slate Quarry	1982
	Gunn, J	Encyclopedia of caves and Karst science	2004
	Brook,A & D, Griffiths,J, Long,M.H	Northern Caves 2	1991
	Rutter,J.G	Prehistoric Gower	1948
	Lawrence,J & Brucker,Roger W	The Caves Beyond	1975
	Taylor,M.C	Three Below Gower	1991
	O'Sullivan,T	Tower of Strength	2001