Official methods of analysis of the Association of afficial analytical chemists / 
edited by Kenneth Helrich. 
 - Fifteen edition. 
 - Arlington, Virginia :  Association of Official Analytical Chemists/  1990. 
 - 1298 pages :  illustrations ;  28 cm. 
<br/><br/><label>ISBN: </label>0935584420 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemistry analytical.