Theerangal guhakal/ 

 - Kozhikode:  Poorna,  2008. 
 - 99p. 
<br/><br/><label>ISBN: </label>9788130009216 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Caves<br/>Geomorphology<br/>Science
<br/><br/><label>Dewey Class. No.: </label>M 551.447  / THE