National Institute of Science Communication CSIR <br/><br/>
The Wealth of India (vol.-IX : Rh-So) 
/ by National Institute of Science Communication CSIR 
 - New Delhi:  National Institute of Science Communication CSIR,  1972. 
 - 472p. 
<br/><br/><label>ISBN: </label>8185038201 
<br/><br/><label>Dewey Class. No.: </label>338.2  / NIS/T