Census of India, 1991 <br/><br/>
Economic tables   Vol. 3, Table B-19 (F), B-21 (F), Pt. III B-B series    

 - Kerala  Govt. Press           1991 
 - VII, 1134p  cm. 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>Y:5.212sN91, N7.12