6th International Symposium on Vulcanospeleology : Hilo, Hawaii, August 1991 / 
Edt. G. Tomas Rea. 
 - Huntsville, Alabama :  National Speleological Society,  1992. 
 - 286 p. :  ill. 
<br/><br/>Includes bibliographical references 
<br/><br/><label>ISBN: </label>1-879-961-02-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vulcanospeleology--Congresses