Balakrishnan Nair, N <br/><br/>
പരിസ്ഥിതിവിജ്ഞാനം / 
by N Balakrishnan Nair 
 - Trivandrum :  State Institute of Languages,  1971. 
 - 355p. : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Dewey Class. No.: </label>577