You can do simple searches using this form:

Type	Originator	Title	Date
	Farr,M	Dan yr Ogof, the jewel of Welsh caves	1999
	Fish,L, Burger,P & Kambesis,P	Deep secrets	1999
	Taylor,D & Howard,T	Jordan, Walks, Treks, Caves, Climbs & Canyons	1999
	Irwin,D & Jarrett,T	Mendip Underground	1999
	Caillault,S	Speleo dans le Vercors (Tome 2)	1999
	Caillault,S, Haffner,D, Krattinger,T & Delannoy,J.J	Speleo dans le Vercors (Tome 2)	1999
	Pittman,Blair	Texas Caves	1999
	Powell,S	The Dudley Limestone mines	1999
	Mitchell. W. R	Tot Lord & the Bone Caves	1999
	Ortega,A.A	Valle de Carranza, Pozalagua, Torca del Carlista y Venta Lape	1999