Helmet, F.  . <br/><br/>
Environmental chemistry /  
by Fritz Helmet. 
 - Delhi :   IVY Publishing House ,   2003 
 - 314p ;  
<br/><br/><label>ISBN: </label>81-7890-077-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemistry
<br/><br/><label>Dewey Class. No.: </label>E:(G:%)  / P3;3