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Type	Originator	Title	Date
	Beck,H.M	Gaping Gill
	Brook,D, Davies,G.M, Long,M.H & Ryder,P.F	Northern Caves Vol 1,Wharfedale & Nidderdale
	Brook,A & D, Davies,G.M & Long,M.H	Northern Caves Vol 2,Penyghent & Malham	1982
	Geologists Association, S.Wales Group	Welsh Geological Quarterly Vol.3 No 2