Devi Hema, B.N. <br/><br/>
Thomas alva edison 
/ by B.N. Hema Devi. 
 - Bangalore :  Sapna Book House,   2001. 
 - 46 p. ;  20 cm. 
 - Divya Darshna Male. .
<br/><br/><label>Dewey Class. No.: </label>530.092 HEM  / KKP026