Bedford, Bruce L. <br/><br/>
Challenge underground:  Bruce L. Bedford 

 - London:  George Allen and Unwin,  1975 
 - 192 p.:  ill.;  20 cm. 
<br/><br/> Inculdes index 
<br/><br/><label>ISBN: </label>0047960434  £ 4.95 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Caving<br/>Cave diving<br/>Cave divers<br/>Caves<br/>Spelunkers
<br/><br/><label>Dewey Class. No.: </label>796.525