Helfferich, Friedrich G., <br/><br/>
Ion exchange / 
Friedrich Helfferich. 
 - Dover ed. 
 - New York :  Dover Publications,  1995. 
 - ix, 624 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and indexes. 
<br/><br/><label>ISBN: </label>0486687848 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ion exchange.
<br/><br/><label>Dewey Class. No.: </label>541.3723  / HEL