You can do simple searches using this form:

Type	Originator	Title	Date
	Telford,W.M, Geldart,L.P & Sheriff,R.E	Applied Geophysics	1990
	Burge,J	Basic Underwater Cave Surveying	1990
	Comite de spel des Alpes Maritimes	Bulletin de liason du CDS 06, Comite de spel des Alpes Maritimes	1990
	Ford,T & Gunn,J	Caves and Karst of the Peak District (BCRA Cave Studies Series No 3)	1990
	Siffre,M	Clamouse	1990
	Taffs Well Climbing and Caving Club	Expedition report	1990
	Heckenroth & Pilgrim	Fledermause	1990
	Tyler,I	Force Crag	1990
	Parein,Rene	Guide Speleo des Montes de Vaucluse	1990
	Gurnee,R & J	Gurnee Guide to American Caves	1990
	Marguareis,M & Liguri,A	IL Complesso Carsico di Piaggia Bella	1990
	Audra,P	Inventaire des Cavites du Basin Versant du Bruyant	1990
		Kungur Ice Cave	1990
	Baritaud,T	L'Aventure Souterraine du Perigord	1990
	Felix,T & Bigotto,P	Le Secret des Bois de Lascaux	1990
	Wilson,J	Lemurs of the Lost World	1990
	Gaubert,G & le Falher,B	Les Cavernes d'Albion	1990
	Bennett,J & Vernon,R.W	Mines of the Gwydyr Forest (Part 2)	1990
	Down,C.G	Mining in Cornwall Today	1990
	Down,C.G	Mining in Cornwall Today	1990
	Down,C.G	Mining in Cornwall Today	1990
	Down,C.G	Mining in Cornwall Today	1990
	Panos,V, Spicak,J & Vozdecky,J	Moravsky Kras	1990
		Postojna Caves	1990
	Jolfre,J	Pyrenees Souterraines	1990
	Marchandet,P	Speleo Sportive dans Les Grandes Causses (No 8)	1990
	Aucant,Y, Frachon,J.C & Schmitt,C	Speleologie en Franche-Comte (Topoguide 1)	1990
	Hughes,S	The Brecon Forest Tramroads	1990
	Hughes,S	The Brecon Forest Tramroads	1990
	Hughes,S	The Brecon Forest Tramroads	1990
	Williams. R & Jones. D	The Cruel Inheritance	1990
	Mills,M.T	The Subterranean Wonders of Sardinia	1990
	Valli,E & Summers,D	The nest gatherers of tiger cave	1990
	Gemmell,A & Myers,J.O	Underground Adventure	1990
	Bradshaw,D.R	Vietnam 90	1990
	Kortman,B & Parma,C	W Jaskiniach	1990