Singh, Y. K. <br/><br/>
Environmental Science / 
by Y. K. Singh. 
 - New Delhi :  New Age International Pub,   1976. 
<br/><br/>Includes indexes. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental Science
<br/><br/><label>Dewey Class. No.: </label>628  / SIN/E