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Type	Originator	Title	Date
	Prior,N.J	Caves Graves and Catacombs	1996
	Stratford,T	Caves of South Wales	1978
	Stratford,T	Caves of South Wales (1978)	1978
	Stratford,T	Caves of South Wales (1982)	1982
	Judson,D (editor)	Caving Practice and Equipment	1991
	Deutscher Verlag der Wissenschaften	Ethnographisch Archaologische Zeitschrift	1965
	Puch,C	Exploracions, Atlas de las Grandes Cavidades Espanolas 1987	1987
	Jimenez,A.N	Facatativa, Santuario de la Rana	1959
	Knott,D	Into the Lost World	1975
	Serko,A & Ivan,M	The cave of postojna and other curiosities of the Karst	1953