Official methods of analysis of the Association of Official Analytical Chemists 
edited by Kenneth Helrich 
 - 15th edition 
 - Arlington, Virginia  Association of Official Analytical Chemists  1990 
 - v. : ill. ; 29 cm. 
<br/><br/><label>ISBN: </label>0935584420  RM826.14 
<br/><br/><label>LCCN: </label>85-647589 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemistry, Analytic