Kenneth Helrich <br/><br/>
Official Methods of Analysis of the Association of Official Analytical Chemists 
Kenneth Helrich 
 - Virginia  Association of official Analytical Chemists, Inc  1965 
<br/><br/><label>ISBN: </label>0935584420 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemistry; Analytical Chemistry
<br/><br/><label>LC Class. No.: </label>QD78  / .O33-1965