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Type	Originator	Title	Date
	Binder,H & Jantschke,H	Hohlenfuhrer Schwabische Alb	2003
	Kowalski,K	Jaskinie Polski 2	1953
	Monico,Paul	Northern Sump Index	1995
	Hill, E & Hall,A	Northern Sump Index 2015	2015
	Comite Nationale de Geographie Commission des Phenom.Karst.	Pyrenees Occidentales Francaise et Region Cantabrique Espagnole	1973
	Greeves,T	Tin Mines and Miners of Dartmoor	1993