Mehta, D.D. <br/><br/>
Positive Sciences 
/by D.D. Mehta 
 - New Delhi:  Arnold Heinemann Publishers;  1974. 
 - 269p. 
<br/><br/><label>ISBN: </label>000 
<br/><br/><label>Dewey Class. No.: </label>294.5  / MEH/P